54 



The brain of man far exceeds in size that of the simiaa compared 

 with the nerves proceeding from it, and in these latter and in the 

 seal it is larger in proportion than in other animals, while it is 

 smallest in the glires, marsnpialia, cheiroptera, and edentata. The 

 largest brain which Soemmering has found in a horse weighed 

 1 lb. 4oz., and in an adult man was 2 lb. 5£oz. : yet the nerves arising 

 from the former were ten times larger than those of the latter. 

 Coeteris paribus^ small animals have a larger brain in proportion 

 to their size, than large ones, and in cold-blooded animals its di- 

 mensions are very small, compared with those of a higher tempe- 

 rature. The following table shows the relative weight of the brain 

 to that of the body in several of the vertebrate classes of animals: — 



Fishes. — Silurus glanis, one-1 887th ; dog-fish, one-1344th ; shark, 

 one-2496th ; carp, one-560th. 



Reptiles. — Turtle, one-5688th; colubar natrix, one-792d ; frog, 

 (amphibious,) one-172d. 



Birds. — Goose, one-360th ; duck, one-257th ; eagle one-260th ; 

 falcon, one-102d ; sparrow, one-25th ; canary-bird, one-14th. 



Cetacea. — Porpoise, one-93d; dolphin, one-102d, one-60th, one- 

 36th, one-25th. 



Solipeda. — Ass, one-254th ; horse, one-700th; one-400th. 



Ruminantia. — Ox, one-S60th; stag, one-290th; sheep, one-192d; 

 calf, one-2l9tb. 



Pachydermata. — Wild boar, one-672d ; domestic, one-512th ; 

 elephant, one-500th. 



Rodentia. — Beaver, one-290th ; hare, one-228th ; rabbit, one- 

 152d; rat, one-76th; mouse, one-43d; field-mouse, one-3 1st. 



Carnivora. — Dog, one-305th, one-47th ; fox, one-205th ; wolf, 

 one-230th; cat, one-156th, one-82d ; ferret, one-138th. 



Plantigrada. — Hedge-hog, one- 1 68th; bear, one-265th; mole, 

 one-36th. 



Cheiroptera. — Bat, one-96th. 



Le?nurs. — Vari, one-84th; mococo, one-61st. 



Baboons. — Magot, one 105th; great baboon, one-104th ; macaque, 

 one-85th. 



Apes. — Mangabey, one-48th; the monk ape. one-44lh ; malbrouk, 

 one-24th. 



Sapajous. — (American apes) Coa'ita, one-41st; Sai, one-25th ; 

 Saimiri, one-22d. 



Onranfr-outangs. — The gibbon, one-48th; chimpanse, 26 inches 

 in height, 11 oz. 7dr. 



Child of six years, one-22d; adult man, one-35th. 



The Cerebellum is smaller in proportion to the cerebrum in 

 man, the saimiri, and the ox, than in any others of the mammalia. 

 In the human subject and in ourangs only, is it covered by the 

 posterior lobes of the brain. The superior vermiform process and 

 the hemispheres of the cerebellum are developed in every class 

 in the inverse ratio of each other. In the saimiri ape, the cerebel- 

 lum is to the cerebrum as 1 to 14 ; in man and the ox, 1 to 9 ; in 



