REPORT OF 

 THE PROSECTOR 



TO THE BOARD OF MANAGERS 



I 



BEG to submit the following Report covering the operations 

 of the Prosector's Department for the past year. 



The material received from the Society's Collections con- 

 sisted of seventy-seven mammals distributed among the orders 

 as follows : 



Primates 24 



Garni vora 18 



Edentata 3 



Rodentia 17 



Marsupalia 15 



Total 77 



There was also received one specimen of the Australian lung- 

 lish, Ceratodus. 



A number of living specimens of AcanthiaH were supplied 

 for anatomical and experimental work on the nervous system 

 by the New York Aquarium. 



The material has been used, as in previous years, in prose- 

 cuting the work of the Department in morphological research 

 and teaching. 



Especial reference should be made to the progress of the in- 

 vestigation of the primate brain stem carried out by the depart- 

 ment under Professor Tilney. This has advanced to a very satis- 

 factory stage making it possible to establish the absolute nuclear 

 homologies in the anthropoid and human brain. The scope of 

 this work includes reconstructions of the gray matter of the 

 brain stems, based on complete serial sections, from the medulla 

 up to and through the optic thalamus, permitting a comparative 

 analysis of the active substance (gray matter) in the brain of 

 the following forms: 



