CEREBRAL MOTOR CONTROL 47 



on account of the long delays, in which there are numerous 

 chances of intercurrent affections taking off some of the animals. 

 Some of these problems have been planned and it is hoped that 

 results will be obtained for a future article using at least two of 

 the animals which have been reported upon here. It is be- 

 cause of this that the brains of the animals now alive have not 

 been taken out and illustrated, but it is expected that a full 

 report upon them will be made at a subsequent time. 



The illustrations which are reproduced are selections of 

 photographs of the animals at different stages. Some of the 

 original photographs were small, and they were enlarged. To 

 make the illustrations stand out well, the backgrounds on some 

 of the negatives were " blocked out" and prints made from them 

 in that condition. In other cases after prints had been made 

 the figures of the animals were cut out. From the photographs 

 without backgrounds the illustrations have been made. Al- 

 though some of the fine detail at the edges of the prints are lost, 

 the principal characteristics have been retained unchanged for 

 there was no retouching of the negatives beyond the changes 

 in the background. 



