6 INTRODUCTION 



the germ layers and embryonic membranes, while the structure of a mam- 

 malian embryo, similar to that of the human embryo, is best observed in 

 the readily-procured embryos of the pig. An idea of the anatomy of 

 embryos is obtained first by examining the exterior of whole embryos and 

 studying dissections and reconstructions of them. Finally, each embryo 

 is studied in serial sections, the level of each section being determined 

 by comparing it with figures of the whole embryo. 



Along with his study of the embryos in the laboratory, the student 

 should do a certain amount of supplementary reading. Only the gist of 

 human organogenesis is contained in the following chapters. A very 

 complete bibliography of the subject is given in Keibel and Mall's ' ' Human 

 Embryology," to which the student is referred. Below are given the 

 titles of some of the more important works on vertebrate and human 

 embryology, to which the student is referred and in which supplementary 

 reading is recommended. 



TITLES FOR REFERENCE 



Broman, I. Normale und abnorme Entwicklung des Menschen. Berg- 



mann, Wiesbaden, 1911. 



Duval, M. Atlas D'Embryologie. Masson, Paris, 1889. 

 Hertwig, O. Handbuch der Entwicklungslehre der Wirbeltiere. Fischer, 



Jena, 1906. 



His, W. Anatomie menschlicher Embryonen. Vogel, Leipzig, 1885. 

 Keibel, F. Normentafel zur Entwicklungsgeschichte der Wirbelthiere. 



Bd. I. Fischer, Jena, 1897. 

 Keibel and Elze. Normentafel zur Entwicklungsgeschichte des Menschen, 



Jena, 1908. 



Keibel, F. and Mall, F. P. Human Embryology. Lippincott, 1910-1912. 

 Kellicott, W. E. A Textbook of General Embryology. Henry Holt, 1913. 

 Kollmann, J. Handatlas der Entwicklungsgeschichte des Menschen. 



Fischer, Jena, 1907. 



Lillie, F. R. The Development of the Chick. Henry Holt, 1908. 

 Minot, C. S. A Laboratory Text-book of Embryology. Blakiston, 1910. 

 Wilson, E. B. The Cell in Development and Inheritance. Macmillan, 



1911. 



