ILLUSTRATIONS. 



Plate I. 



Fig. 1. Mesial surface of model of right liemisphere showing separation of sec- 

 tions. Mendoza and Ramirez. 



2. Superior view of the first section from the base of the hemisphere. 



Mendoza and Ramirez. 



3. Superior surface of the second section from the base of the hemisphere. 



Mendoza and Ramirez. 



Plate II. 



Fig. 1. Coronal section number 5, showing the posterior surface. Mendoza and 

 Ramirez. 



2. Coronal section number 6, showing the posterior view. Mendoza and 



Ramirez. 



3. Model of the rig-lit hemisphere of a human brain viewed from the side. 



Valencia. 



Plate III. 



Fig. 1. Same as Plate II, fig. 3, with the flr.st lateral section of the cerebral 

 hemisphere removed. Represents a sagittal section 4.5 centimeters 

 from the mesial surface. Valencia. 



2. Same as Plate II, fig. 3, with the first and second sagittal sections re- 



moved. Represents a sagittal section 3 centimeters from the mesial 

 surface. Valencia. 



3. With the first, second, and third lateral sagittal sections removed. 



Represents a sagittal section 1.5 centimeters from the mesial surface. 

 Valencia. 



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