This is an authoritative and accessible introduction to the study of vertebrate embryology. The book is structured around the development of three model organisms: the frog, chick, and mammal. Through a detailed analysis of the embryonic development of these animals, the author provides readers with a comprehensive understanding of the fundamental principles of embryology. The book is aimed at undergraduate students in the biological sciences, and will also be of interest to researchers and professionals in the field. This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.