Early Embryology of the Chick

aTlhe first edlition of this book appeared in 1920. I uised the tllir(l edition as an undergraduate studenlt in an embryology course in 1946. As a student I found the book to be excellent. In the laboratory portion of the course I found tlle il-lulstrations to be a perfect guide as I studied the living dleveloping chick embryo. Nearly all of the illustrations were drawn by Dr. Patten from direct observations. In both the earlier and the present fifth edition Dr. Patten states as thle plan an(l scope of this book, "This book on the development of the cllick has been written for those wlho are beginning the study of embryology and lhas accordingly been kept as brief and uncomplicated as possible." Dr. Patten has done a remarkable job in sticking to this statement througli all of the editions. Tlle 1971 edtition lhas only 56 more pages than the third eclition. Most of the ad(led pages are the result of the expansion of an excellent bibliograplhy at the end of tlle book. The remainder of additional pages are the result of the inclusion of new experimental findings that help clarify certain changes the clhick embryo undergoes. Since alterations in the way the chick embryo develops are governed by the process of evolution, this book will be more than adequate for the study of chick embryology for many, many years to come.