Chapter WI 

 TROGLODYTES GORILLA, ITS BRAIN AND BEHAVIOR 



Its Position, amonti the Primates; Afeasuremenls and Brain Indices; Surface 

 Anatomy of the Brain; Inter^ial Structure of the Brain Stem in Cross Section 



Appearance of the Gorilla 



"^HE gorilla, in point of size, when standing upright, is nearly as tall 

 as the average man. Its recorded measurements give it a height of 

 live feet two inches to over six feet. Its body is stout and large, its 

 legs short and its arms long. The tips of its lingers reach to about the middle 

 of the leg below the knee. Its huge grisly head, Hat, broad nose, prominent 

 muzzle, large mouth, very large canines, and protruding ears which are 

 uncovered bj- hair, all contribute to gi\e the animal a terrifying appearance 

 upon which is based much of its generally accepted reputation for ferocity. 

 In some instances the full-grown adult attains the great weight of between 

 three hundred and four hundred pounds. This fact, added to its awe-inspiring 

 locomotion when it rises upon its hindlegs and stretches forth its tremendous 

 arms, has made the gorilla known as the most savage of all beasts, and at the 

 same time one of the most dangerous of all the enemies ol man. 



The hands are large and wrinkled, thickl\ covered w ith hair on the back, 

 but the palmar surfaces are without hair and present cutaneous rugae, no 

 doubt in the interest of amplifying the areas for sensory receptors. The 

 thumb is somewhat short for the size of the hand but is thick and bears a 

 broad nail. The great toe is opposable, large and Hat, and the proximal phal- 

 anges of the second, third and fourth toes are united by a wob. 



The animal's body, as well as the head uj) to the brow-line, is covered 



w ith shaggy hair. The skull is massive and the eyes surmounted by protrud- 



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