OBSERVATIONS ON THE DEVELOPMENT OF THE HYPOPHYSIS 



CEREBRI AND PROCESSUS INFUNDIBULI IN 



THE DOMESTIC CAT. 



By FRANK S. ABY 



These observations were made and recorded in 1889. ^^^ 

 photographs from which the accompanying illustrations were 

 prepared were made at that time, and all the statements that 

 are to be found in the Summary at the close of this paper 

 were recognized and recorded then. 



Partial arrangements were made for pubhshing these obser- 

 vations, but from various causes the work has been delayed. 

 The recent attempt of embryologists to homologize through- 

 out the Vertebrata the structures that form the subject of this 

 paper have urged the publishing of my observations, from the 

 behef that the facts of observation here presented may be 

 useful to future attempts in this direction. 



The matter of nomenclature is becoming a serious question 

 to the Biologist, especially with regard to the central nervous 

 system. The vocabulary suggested by Wilder and Gage^ 

 has many features to recommend it, but there are some diffi- 

 culties in the way of its universal adoption. With regard to 

 the embrvological terms the recent work of jNIinot^ employs a 

 set of words radically differing from those used by Balfour 

 and other embryologists who used the English language. 

 Whether it is better or not, to supplant terms such as cpid/asf, 

 mesodlas/, and hypoblast, by such words as ectoderm^ niesodenn, 



1 Anatomical Technology, by Wilder and Gage. A. S. Barnes & Co., New 

 York and Chicago. 18S2. 



2 Human Embryology, hy C. S. Minot. William Wood >*v: Co., New York 

 1S92. 



