"Manners and Monuments of Prehistoric Peoples" by The Marquis de Nadaillac is a scientific publication likely written in the late 19th century. The work serves as a comprehensive survey of the various aspects of prehistoric human life, exploring their practices, artifacts, and societal structures based on archaeological findings. The opening of this volume lays the groundwork for the subsequent examination of prehistoric peoples by reflecting on the significant advancements in scientific exploration and knowledge that characterized the 19th century. It highlights the profound interest in uncovering the mysteries of early human civilizations and their enigmatic practices. The text begins with a discussion of the Stone Age, addressing various inquiries related to early humans, including their origins, lifestyle, tools, and the environmental conditions they faced. It acknowledges the ongoing debates in archaeology about the classification of prehistoric periods and leads into an exploration of artifacts and their implications on our understanding of human history. (This is an automatically generated summary.)

"The Prehistoric World; Or, Vanished Races" by Emory Adams Allen is a scientific publication written during the late 19th century. This work aims to explore and explain the life and times of prehistoric humanity as inferred from archaeological evidence, covering both the Old and New Worlds and considering various ancient civilizations, including those in Mexico and the Pacific Isles. At the start of the book, the author introduces the complexities and mysteries surrounding the study of prehistoric man, discussing the limitations of historical records and the importance of gathering evidence from archaeological findings to understand humanity’s distant past. Allen emphasizes the necessity of scientific inquiry and methodology in reconstructing history while advocating for a more comprehensive understanding of man's long existence on Earth, marked by gradual advancements in culture and civilization. He reviews the geological epochs correspondingly, linking them to the development of life on Earth and setting the stage for an in-depth examination of prehistoric societies that once thrived across the globe. (This is an automatically generated summary.)