36 ON THE ANATOMY OP THE 



drupeds, seems to have the smallest brain in propor- 

 tion to his body. 



The position of the falx and tentorium in the 

 Orang, have much resemblance to those parts in 

 mail ; but the anterior portion of the former reaches 

 farther down than in man, dividing the two branches 

 of the olfactory nerve near the crista galli. The 

 breadth of the falx from the back of the head to 

 the anterior edge of the tentorium measures 1.4 

 inch ; and from that point to the spine of the fron- 

 tal bone, in a straight line, ±= 2.6 inches : propor- 

 tions somewhat different from those of the human 

 head. The nerves arising from the brain come off 

 as in man. The first pair, or olfactory nerve, are 

 larger and broader than in the human subject. 

 The second pair, or optic nerve, are considerably 

 less divergent than in man. The third, fourth 

 and fifth ?pairs, the last of which consists of two 

 fasciculi in each, and the sixth pair, are precisely 

 like the corresponding nerves in man. The seventh 

 or auditory nerve has a portio dura and mollis, with 

 the intervening fibrils. The eighth pair, consist- 

 ing of the glosso-pharyngeus and the small fasci- 

 culi of the par vagum, aided by the accessory nerves, 

 present nothing different. The ninth pair consist 

 each, as in man, of three bundles of fibres. 



In pursuing the course of the nerves, we found 

 the distribution of the great sympathetic, and the 

 position of its great ganglion in the neck, very 

 similar : but this ganglion was of a deeper ash co- 



