DESCRIPTION OF PLATE. 



All of the figures are at about the natural size of the dry specimens 

 and were prepared according to the castor oil method. 



The transections show the differentiation of the alba and cinerea. 



Fig. I and 6 are from the sheep, Ovis aries. Fig. 2 and 5 are from 

 the dog, Canis familiaris. Fig. 3 is the mesal view of the right hemi- 

 cerebrum of Macacus rhesus. Fig. 4 is the lateral aspect of the right 

 hemicerebrum of Macacus cynomolgus. 



