vi PREFACE. 



with the organs described in the chapter. In Chapter XIX (Teratogenesis) 

 the nature and origin of the more complex anomalies and monsters are dis- 

 cussed, and also the causes underlying the origin of malformations. 



The writers wish to thank Dr. Oliver S. Strong for his painstaking work on 

 the chapter on the Nervous System. Dr. Strong in turn wishes to acknowledge 

 his indebtedness to Dr. Adolf Meyer for important ideas underlying the treat- 

 ment of his subject, and also for many valuable details. He expresses his 

 thanks also to Professors C. J. Herrick, H. von W. Schulte and G. L. Streeter 

 for helpful criticisms and suggestions. The writers would also express their 

 thanks to Dr. H. McE. Knower for helpful criticisms on Part I and the 

 chapter on Teratogenesis; to Dr. Edward Learning for making the photo- 

 graphs reproduced in the text; to the American Journal of Anatomy for the 

 loan of plates; and to Messrs. William Wood & Company for their uniform 

 courtesy and kindness. 



FREDERICK RANDOLPH BAILEY. 

 APRIL i, 1909. ADAM MARION MILLER. 



