Twelve Lectures On Comparative Embryology is a book written by Louis Agassiz in 1849. The book is a collection of twelve lectures given by Agassiz on the topic of comparative embryology, which is the study of the development of different species of animals. In the book, Agassiz discusses the similarities and differences in embryonic development among various groups of animals, including fish, reptiles, birds, and mammals. He also explores the role...