The Run by John Hay is a work of nature writing and natural history written in the mid-20th century. It explores the spring migration of alewives on Cape Cod, weaving close observation with ecology, local history, and culture. Guided by a reflective narrator and figures such as a blunt, protective herring warden, it portrays the fish’s sea-to-pond journey, its perils, and its long ties to human communities. The opening of this work follows the narrator’s March vigil at Brewster’s Herring Run on Stony Brook, moving from raw “waiting weather” and a watchful muskrat to the first lone alewife and then the mass run. He introduces Harry Alexander, the warden, and shifts between scene and context: the anadromous life cycle, age and size patterns, and the fish’s historical place from Indigenous agriculture and Pilgrim survival to smokehouses, weirs, and today’s lobster-bait trade. Vivid set pieces show crowded ladders, fatal leaps at an impassable chute, and gulls thronging the valley, while chapters mix anatomy and senses with puzzling questions of homing, ocean whereabouts, and environmental cues. He traces the brackish plume at Paine’s Creek, witnesses night entries under gull-filled skies, then a brutal daylight hunt where hundreds of gulls intercept fish on the ebb, and concludes with the fish’s back-and-forth ascent at the estuary threshold as salt gives way to fresh. (This is an automatically generated summary.)

"La vérité sur le prétendu Silphion de la Cyrénaïque : ("Silphium cyrenaicum",…" by F. Herincq is a scientific pamphlet written in the late 19th century. It is a botanical and therapeutic critique that challenges the identification of a modern plant from Cyrenaica as the famed silphion of antiquity, and questions the medical claims attached to it. The work dismantles the claim that the so‑called Silphium cyrenaicum equals the ancient silphion, demonstrating instead—through seed, leaf, root, and anatomical comparisons with herbarium specimens and literature (Viviani, de Candolle)—that it is simply Thapsia garganica. Field evidence from M. Daveau’s expedition to Cyrenaica confirms the match and refutes assertions about “tracing” roots and universal seed destruction. The book contrasts ancient descriptions (parsley‑like leaves, edible parts, culinary use) with the modern plant’s vesicant, dangerous resin, and rejects coin imagery as unreliable for species diagnosis. It also scrutinizes promotional medical claims (phthisis, meningitis, etc.), reproducing a decisive letter from Dr Chartier denying therapeutic benefit and noting failures and risks. An appendix critiques contemporary brochures and clarifies sources, ending with the firm conclusion that the celebrated silphion remains lost while the marketed substance is merely Thapsia garganica. (This is an automatically generated summary.)

"Agricultural zoology" by J. Ritzema Bos is a scientific handbook written in the late 19th century. It surveys the animal kingdom with an emphasis on species that harm or help farming, offering clear identification, biology, and practical notes for students and working farmers. The opening of the book sets its purpose and audience in the author’s and translator’s prefaces, with Eleanor A. Ormerod’s introduction underscoring its practical value; a detailed contents list signals broad coverage from vertebrates to protozoa. It then explains zoological classification and binomial naming, followed by a concise primer on vertebrate anatomy and physiology (skeleton, muscles, nerves, digestion, circulation and respiration, reproduction including alternation of generations), and how heart structure differs across vertebrate classes. The text proceeds into applied accounts of mammals relevant to agriculture: cats, dogs, foxes, and mustelids (marten, polecat/ferret, stoat, weasel, mink, otter, badger) with balanced notes on damage versus benefits; insect-eaters (shrews, the mole, hedgehog) largely presented as allies; bats as valuable nocturnal insect hunters; and rodents (hares and rabbits, then mice and rats) with concise identification and their typical harms. This opening portion concludes mid-discussion of mouse and rat species and their agricultural impact. (This is an automatically generated summary.)

"Straußenpolitik : Neue Tierfabeln" by Th. Zell is a collection of popular zoological essays written in the early 20th century. The work challenges common “animal fables” and anthropomorphic assumptions, replacing them with evidence-based explanations from natural history and field observation. It examines the adaptive logic behind animal form and behavior, from hippos and giraffes to predators, domesticates, and birds, arguing that utility, ecology, and risk—not human-like motives—drive what animals do. The tone is skeptical yet accessible, appealing to readers who enjoy myth-busting about the natural world. The opening of the book sets the program: a brief foreword promises a continuation of earlier myth critiques, then the author refutes “improvers” who claim nature botched the hippo and giraffe, showing why bulk, long legs, and browsing diets are advantageous and why zoo feeding misleads. He distinguishes shame from guilt, arguing animals likely lack shame but may show guilt or awareness, illustrated with dogs, goats, and an ape understanding consequences, while reinterpreting feline “embarrassment” as hunting limits or habit. He explains predators’ caution toward humans as rational risk-avoidance given our unpredictable weapons, not awe of upright posture, and notes how hunger or infirmity yields man-eaters. He disputes that only herd animals can be domesticated, contrasting tameable solitary species (lynx, cheetah) with dangerous or impractical herd species, and stresses danger, temperament, and human utility as the real factors. He recasts equine “nervousness” as justified vigilance of fleeing herbivores shaped by predation, illustrated by zebras, deer startling at sudden events, and the contrasting boldness of defensive bovines. Finally, he questions claims that animals “admire themselves” in mirrors, using a titmouse at a mirror to argue recognition is misread, before the discussion cuts off. (This is an automatically generated summary.)

"Von Sonnen und Sonnenstäubchen : Kosmische Wanderungen" by Wilhelm Bölsche is a collection of popular-science essays written in the early 20th century. The volume ranges across astronomy, geology, evolution, and animal life, blending travel vignette, philosophy, and clear exposition to make modern science vivid to general readers. Its unifying theme is a human-scaled tour through cosmic and natural history, from suns to “sun-dust,” showing how scientific facts cohere into a larger, poetic vision of the world. The opening of the volume begins with a preface that calls Earth and humanity “sun-dust” and states the aim of throwing clarifying light onto the heaped “dust” of modern facts so they shine as a unified whole. It then follows a night hike in the Riesengebirge, where a tear in the fog reveals the Milky Way and sparks a sweeping meditation from ancient myth and medieval spheres to the Age of Discovery, Copernican astronomy, Newtonian law, energy conservation, geological deep time, and evolutionary ascent. Using striking analogies—the Berlin city map to scale the solar system, and a coin’s edge to explain why the Milky Way appears as a bright band—the narrative reviews ideas from Democritus, Dante, Copernicus, Galileo, Bruno, Newton, Robert Mayer, Kant, Herschel, Humboldt, Kirchhoff, Bunsen, Draper, and Scheiner. It separates gaseous nebulae within our stellar system from true “island universes” and, via spectroscopy (Fraunhofer lines) and photography, argues that the Andromeda nebula is a distant star system beyond our own, before turning to the pitfalls of perception and the newly fixed shapes of nebulae, leading toward the famous Ring Nebula. (This is an automatically generated summary.)

The chocolate-plant (Theobroma cacao) and its products by Anonymous is a scientific and industrial pamphlet from the late 19th century. It surveys cacao’s origins, botany, chemistry, cultivation, processing into chocolate and cocoa, their nutritional qualities, and practical culinary uses. The book opens with the pre-Columbian and early colonial history of cacao, describing indigenous roasting, grinding, and foaming methods and the swift spread of chocolate in Europe. It then details the plant’s morphology and growth, the bearing of pods on older wood, shade and irrigation needs, harvesting, fermentation (“sweating”), drying, and major producing regions. A technical chapter characterizes commercial beans microscopically and chemically, noting starch, cellulose, proteins, theobromine, ash, and especially cocoa-butter. Manufacturing chapters explain cleaning, roasting, winnowing to nibs, fine grinding into plain or sweetened chocolate, pressing to reduce fat for breakfast cocoa, and caution against chemically alkalized cocoas that diminish natural flavor. A physiological section argues cacao’s value as real food—combining carbohydrates, proteins, minerals, and theobromine—and explains why partial fat removal can aid digestion while purity and fineness are essential. The closing portion offers cooking guidance and recipes (by Mrs. Ellen H. Richards and Miss Parloa) for properly boiling chocolate and cocoa and for using them in drinks, cakes, icings, ice-cream, puddings, and Bavarian cream. (This is an automatically generated summary.)

"First course in biology" by L. H. Bailey and Walter Moore Coleman is a secondary-school biology textbook written in the early 20th century. It presents plant, animal, and human biology as a unified, practical course that favors observation, experiment, and everyday relevance over rote facts. Readers can expect clear explanations, abundant classroom and field exercises, and an ecological perspective that ties structure and function to environment. The opening of the textbook sets a reform-minded tone, advocating a single unit course in biology for secondary students and outlining flexible ways to sequence plant, animal, and human topics. A general introduction then builds essential chemistry and physics skills through simple experiments—testing acids and bases, starch, sugar, proteids, and fats; making oxygen; demonstrating oxidation; contrasting organic and inorganic matter; and analyzing a candle flame to reveal oxygen consumption, carbon (soot), and carbon dioxide. Plant Biology begins by stressing variation, environmental struggle, and selection (including human selection in breeding), then surveys plant societies (ecology), plant parts and life histories (annuals, biennials, perennials). It proceeds to seeds and germination with hands-on studies of beans, castor beans, corn, and gymnosperms, and concludes with root forms and functions—tap and fibrous systems, aerial and adventitious roots, root hairs and osmosis, nitrogen-fixing nodules, and the importance of moisture, temperature, and air—ending mid-discussion of root structure. (This is an automatically generated summary.)

"Disease in captive wild mammals and birds : incidence, description, comparison." by Herbert Fox, M.D. is a scientific monograph written in the early 20th century. It compiles systematic autopsies of zoo-kept mammals and birds to measure how often diseases occur, describe their pathology, and compare patterns across taxonomic orders, with practical guidance for zoo medicine, husbandry, and comparative pathology. The opening of the volume presents a foreword describing the Philadelphia Zoological Garden’s routine postmortems since the early 1900s and their dividends—improved hygiene and disinfection, halted outbreaks, and dramatic reductions in tuberculosis in monkeys and spiropteriasis in parrots—while reflecting on disease in wild versus captive settings and on captivity’s stresses (diet, climate, fear, boredom, loneliness, reproductive challenges). The Introduction sets the scope and method: thousands of standardized autopsies organized by order to track incidence and describe lesions, alongside candid limits of clinical diagnosis and the cautions of extrapolating captive data to the wild. It surveys management factors (diet and vitamins, housing and temperature, flooring), the roles of parasites and epizootics, key differences in avian versus mammalian inflammatory responses, and broad longevity patterns, and it acknowledges the laboratory team and the taxonomic framework. The section closes with classification and autopsy counts and begins the heart-disease chapter, outlining how degenerations, inflammations, and enlargement (muscle bulk versus chamber size) will be compared across taxa. (This is an automatically generated summary.)

"Het paard : in zijne natuurlijke ontwikkeling" by Wilhelm Bölsche is a popular scientific treatise written in the early 20th century. It explores the natural history and evolution of the horse, tracing its lineage from small, multi‑toed ancestors to the modern, single‑toed runner, and examines its close symbiosis with humans as a domesticated animal. Expect a blend of anatomy, paleontology, and behavioral insight that connects fossil evidence, comparative anatomy, and cultural history to explain what makes the horse unique. The opening of this work sets out its purpose: to tell the full evolutionary story of the horse, beginning with tiny Eocene ancestors and linking them to living forms and domestic breeds. It recaps the rise of mammals from reptile‑like forebears through monotremes and marsupials to early placental groups, highlighting a pivotal Eocene fauna (the “Cernays” forms) from which hoofed animals emerge. The text defines domestication as a lasting symbiosis rather than mere captivity, illustrating the idea with classic plant–fungus and ant–aphid partnerships before applying it to horses, dogs, and livestock. A clear, step‑by‑step anatomical comparison explains how the horse stands on a single middle toe, with splint bones as vestiges of lost digits, and how this design achieves speed, endurance, and load‑bearing. It then sketches the horse’s instincts and signal‑sensitivity (including the “Clever Hans” case) and turns to the fossil record, from Cuvier’s early finds to the rich American deposits, noting that true horses once ranged widely in the Americas before disappearing there prior to European contact. (This is an automatically generated summary.)

"Evolution made plain by John Mason" is a concise popular science pamphlet written in the early 20th century. It is a scientific publication that introduces the theory of evolution in plain language, explaining how natural selection and other natural laws account for the development of all life, including humans. The book defines what evolution is and is not, separates it from common misconceptions, and surveys geological time and the fossil record to show a progression from simple to complex forms. It marshals anatomical and embryological evidence (homologies, vestigial organs, and stages of development), discusses “connecting links,” and compares humans and apes alongside early human fossils. It explains natural selection, variation, artificial selection, and the idea of mutations, then extends these ideas to social thought, urging free inquiry and tolerance while criticizing biblical literalism and popular objections. In its final sections it applies heredity and environment to human progress, argues for the primacy of the common good, and controversially advocates eugenic measures, calling for improved environments and responsible reproduction as the path to future advancement. (This is an automatically generated summary.)

Blonde duinen by Jac. P. Thijsse is an illustrated popular natural history book written in the early 20th century. It offers guided rambles through the Dutch coastal dunes, using vivid observation and approachable explanations to reveal how plants, animals, and landscapes fit together. Expect seasonal field sketches that blend storytelling with fieldcraft, encouraging readers—especially the young—to notice, collect, and care about the living world. The opening of the work sets out a friendly preface: these “nature albums” are meant to put good color plates and real outdoor experience within easy reach, so that young people learn nature by seeing. It quickly shifts into lively dune vignettes: a teacher’s cheerful “rabbit hunt” with pupils for skulls becomes a lesson in snares, scavengers, and rabbit life (burrows, frosty signs, rampant breeding, evening grazing). A birch-dale chapter follows with bark and fungus, then moths and larvae as masters of disguise (buff-tip, peppered moth, emerald), plus birds such as nightingale, song thrush, willow warbler, and a few deft plant notes (violets’ self-fertilizing flowers, garlic mustard with orange-tip). A June evening piece captures flowers closing and opening, moth- and hawk-moth pollination, and the arrival of bats, toads, hedgehogs, shrews, nightjars, grasshopper warblers, and stone-curlews. A hot June afternoon rounds it out with hedgerow and dune blooms, June beetles in roses, leafcutter bees fashioning brood cells, climbing bryony, showy ragwort and mullein feeders, and small passerines like tree pipit and whinchat—set against the brood-parasitic cuckoo. Overall, these first chapters read as gently didactic rambles that model how to notice, name, and connect dune life. (This is an automatically generated summary.)

"L''Afrique centrale française : Récit du voyage de la mission" by Auguste Chevalier et al. is a scientific travel account and expedition report written in the early 20th century. It chronicles the French Chari–Lake Chad mission through Central Africa, blending route narratives with studies in botany, geology, ethnography, and colonial economics. The focus is on mapping regions between the Congo, Oubangui, and Lake Chad, establishing experimental gardens, and assessing resources such as rubber, copal, and food crops within the context of French colonial administration. The opening of this account explains how the mission was conceived, funded, and staffed, outlining official backing, scientific aims, and the team’s roles. It follows the party from France to Brazzaville via the Congo railway, contrasts the disrepair of Brazzaville with the orderly Belgian Léopoldville, and details early botanical work that identifies the so‑called “grass-root rubber” from Landolphia species. The narrative then shifts to the river journey up the Congo and Oubangui toward Bangui, with close observation of forests, islands, copal and oil palms, village agriculture, and abandoned settlements linked to recent unrest, while noting evolving local customs and the spread of introduced crops. It closes in this excerpt with vivid travel notes and a clear critique of abuses by concession agents and poorly supervised troops as the boat reaches Bondjo-country villages like Isasa. (This is an automatically generated summary.)

"Alpine flora of the Canadian Rocky Mountains" by Stewardson Brown is a scientific publication written in the early 20th century. It is an illustrated botanical manual and field guide to the alpine and subalpine plants of the Canadian Rockies and Selkirks, with identification keys, concise descriptions, habitats, and notes on distribution. The work focuses on plants along the Canadian Pacific Railway corridor between Banff and Glacier, and is designed for naturalists and travelers seeking to recognize the region’s trees, shrubs, ferns, and wildflowers. The opening of the work presents a preface outlining scope and audience, distinguishing the drier, cold-adapted flora of the Rockies from the moisture-loving Selkirks, and noting that grasses, sedges, and willows are omitted to keep the guide practical; it also explains the arrangement by families, with keys and numerous new illustrations. A glossary and a comprehensive family key follow, leading into detailed species accounts that begin with ferns and their allies (e.g., moonworts Botrychium, maidenhair Adiantum, bracken, horsetails Equisetum, club-mosses Lycopodium, Selaginella), then conifers and other woody plants (whitebark pine, Douglas-fir, mountain hemlock, Alberta spruce, junipers, giant cedar, yew). Subsequent sections introduce early-blooming monocots and allies, such as western skunk cabbage, bunch-flowers (Veratrum, Zygadenus, Tofieldia), lilies (mountain-lily, snow lily), and lily-of-the-valley relatives (Clintonia, false Solomon’s seal, twisted-stalk, Kruhsea), each with habitat, elevation, and flowering times, and frequent notes on whether a plant is more typical of the Rockies or Selkirks. The text is systematic, field-oriented, and richly illustrated at the outset. (This is an automatically generated summary.)

"The giant sequoia : An account of the history and characteristics of the big…." by Rodney Sydes Ellsworth is a natural history and historical account written in the early 20th century. It blends science, travelogue, and advocacy to explain the giant sequoia and coast redwood—their deep antiquity, form, range, and the human history entwined with them, especially in the Mariposa Grove. Readers can expect vivid portraits of famous trees, clear distinctions between the two Sequoia species, accounts of the Sierra Nevada’s making, and a strong conservation message about threats, vandalism, and protection. The opening of this work sets out a popular-yet-faithful synthesis of scientific and literary sources, then traces the sequoia’s fossil-deep lineage, its survival through volcanic cataclysms and glaciations, and its present restriction to California’s coast and Sierra belts. It contrasts the coast redwood’s soaring height and immense timber yields with the giant sequoia’s unmatched girth and longevity, and maps their modern groves—highlighting the Mariposa and the vast southern forests like the Giant Forest. A substantial section recounts Galen Clark’s life: his discovery and early guiding at Wawona, the building of trails and roads, the 1864 Yosemite and Mariposa Grove grant, his long guardianship, fire protection and brush clearing, and the criticism and praise that followed, ending with the commissioners’ formal tribute. The narrative then tours the Mariposa Grove itself—its easy access, compact grandeur, and named specimens (such as the Grizzly Giant, the exceptionally tall Mark Twain Tree, and the symmetrically flawless Alabama Tree)—while explaining fire scars, hollow “chimney” trunks, and great fallen logs like the Fallen Monarch. It condemns wasteful lumbering and exhibition vandalism in other groves but notes that Mariposa was spared, aside from the famous vehicle passages cut through the Wawona and California trees. The section closes with emblematic scenes like the intertwined “Faithful Couple” and the glowing “Sun Worshippers,” underscoring the grove’s majesty and the case for its preservation. (This is an automatically generated summary.)

"The flowering plants of South Africa; vol. 5" by I. B. Pole Evans is an illustrated botanical magazine published in the 1920s. Part of a pioneering series depicting Africa's flowering plants, this volume features hand-colored lithographic illustrations created through meticulous family craft traditions. The magazine showcases botanical specimens from Africa and neighboring islands, combining scientific description with artistic beauty in an era when each plate required skilled artists to apply watercolor by hand. (This is an automatically generated summary.)

"Australian insects" by Walter W. Froggatt is a scientific textbook written in the early 20th century. It surveys Australia’s insect fauna in a clear, engaging way while retaining scholarly rigor, with emphasis on classification, morphology, distribution, and practical economic entomology. Intended for both general readers and students, it proceeds systematically through major orders, illustrating distinctive Australian species and their habits. The opening of the volume sets out the aim to marry popular exposition with scientific accuracy, noting the historical difficulty of scattered, obscure descriptions and the rise of field-based, economically useful entomology. It then outlines rules of classification and naming, comments on Australia’s distinctive, climate-shaped fauna and its affinities, and explains insect structure, metamorphosis, respiration, and senses, followed by a brief review of the sparse local fossil record. The systematic accounts begin with Aptera (springtails and silverfish), then Orthoptera, covering earwigs and cockroaches, and giving an extended, illustrated treatment of termites—their castes, royal chamber, mound forms (including “magnetic” north–south mounds), and key genera. Brief sections introduce web-spinners newly recorded from Australia, book lice, and predatory mantids with their egg masses, before turning to phasmids with striking leaf- and stick-mimicry. The opening closes as it enters the short-horned grasshoppers (Acridiidae), describing their anatomy, oviposition, sound-making, and exemplifying the section with the yellow-winged locust. (This is an automatically generated summary.)

"Sir William Flower" by Richard Lydekker is a scientific biography written in the early 20th century. It profiles the eminent comparative anatomist and museum reformer Sir William Henry Flower, tracing his path from a nature‑obsessed boy and army surgeon to Conservator of the Royal College of Surgeons’ museum and Director of the Natural History Museum. The work highlights his research on mammals (notably whales), his anthropological studies, and his pioneering ideas on museum display and scientific nomenclature. The opening of the book sketches Flower’s early life, self‑propelled love of natural history, and medical training, followed by his Crimean War service and return to London, where he combined hospital duties with research, married into a scientifically connected family, and began publishing. It then moves to his decisive shift from medical practice to the Royal College of Surgeons, his rise to Hunterian Professor, and his growing public presence—honours, society leadership, and advocacy on animal welfare and conservation—alongside a portrait of his character and final years. The narrative next details his museum achievements: enlarged and clearer human anatomy displays, exemplary preparation and mounting of skeletons, a comparative “homologous bones” series, and catalogues that integrated recent and fossil material, together with firm, commonsense views on stabilising nomenclature and resisting needless generic splitting. His Hunterian lectures—on mammalian osteology and dentition, cetaceans, digestive organs, and the physical anthropology of diverse peoples—are summarized, including the influential textbook that grew from them. Finally, it introduces his Directorship of the Natural History Museum and the creation of the educational Index Museum with realistic taxidermy, lucid labels, and distribution maps, and signals his push to bridge the divide between biology and paleontology, leading into his reorganisation of the mammal gallery. (This is an automatically generated summary.)

"Bog-trotting for orchids" by Grace Greylock Niles is an illustrated nature travelogue written in the early 20th century. It follows an avid orchid hunter across the bogs, streams, and hills of the Hoosac Valley, blending engaging field notes with local geology, folklore, and a strong conservation ethic. Readers can expect intimate portraits of lady’s slippers and other wildflowers, vivid scenes of Berkshire and Bennington landscapes, and reflective episodes with the author’s trusty hound and curious local children. The opening of this work sets the scope and mood: a preface locates the Hoosac Valley within the Taconic Mountains, notes the richness of North American orchids, and frames the excursions as seasonal searches for both orchids and their companion plants. The first chapters trace the author’s route from New York through New Haven to North Adams, with early field stops featuring walking fern, azaleas, and the dramatic setting of Mount Greylock and the Hoosac Tunnel. She then undertakes strenuous “bog-trotting” along Ball Brook and the Bogs of Etchowog, finding pink and yellow lady’s slippers, pitcher plants and sundews, and naming a lush ravine the Glen of Comus, while describing the hazards of quaking peat and “dead holes.” A local girl leads to the rare Ram’s-Head lady’s slipper, prompting close botanical description; a later episode laments children stripping blooms and the trade in medicinal roots, segueing into concise notes on orchid pollination from Gray and Darwin. The section closes with the first pale blooms of the queenly showy lady’s slipper, sightings of green and white Habenaria, a search for the showy orchis, and observations on the variable yellow Cypripediums. (This is an automatically generated summary.)

"A history of evolution by Carroll Lane Fenton" is a concise historical account of science written in the early 20th century. It surveys the development of the idea of organic evolution—what it is, how it works, and how people came to accept it—moving from ancient speculation to modern scientific methods. The book opens with Greek nature-philosophers (Thales, Anaximander, Empedocles, Aristotle, Epicurus, Lucretius), then follows the thread through early Christian thinkers (notably Augustine), medieval Arabic scholarship, and the Renaissance and Enlightenment philosophers (Bacon, Descartes, Leibnitz, Kant) who argued for natural causes. It contrasts fanciful “speculative” writers with the “great naturalists”: Linnaeus’s classification, Buffon’s variability and environment, Erasmus Darwin’s transformist hints, and Lamarck’s use–disuse and branching descent, with support from St.-Hilaire, Goethe, and Treviranus. The core narrative centers on Charles Darwin’s method and synthesis—variation, the struggle for existence, and natural selection—his evidence, the controversy, and Huxley’s public defense. Post-Darwin, it reviews refinements and excesses, then highlights de Vries’s mutation theory and shows how selection and mutation can both operate, closing with the rise of genetics and experimental breeding, alongside ongoing evidence from paleontology, anatomy, and embryology, to affirm evolution as a well-established, continually investigated fact. (This is an automatically generated summary.)