PREFACE ix 



Dr. James Ewing, Professor of Pathology, and Dr. Jeremiah S. Ferguson, 

 Instructor in Histology, of the Cornell University Medical College, 

 assisted me greatly in the preparation and selection of histological 

 objects. Professor Gage, of Cornell University, furnished the photo- 

 graph of a human embryo, reproduced in Fig. 226. Dr. Israel Strauss, 

 Instructor in Embryology in the Cornell University Medical College, 

 furnished the sections of chick, reproduced in color in the Atlas. With- 

 out such valuable assistance, the illustration would have been more 

 difficult and much less satisfactory. 



AUSTIN FLINT. 

 NEW YORK, 

 July, 1905. 



