596 RELATIVK SIZE OF THE BRAIN 



species of mammalia, is exceedingly email : but 

 as he is made up chiefly of lungs, blood, and 

 muscles, he is the swiftest of all runners except 

 the ostrich. The brain of the horse and ox 

 varies in weight from 1 Ib. 4 oz. to 1 Ib. 7 oz. ; 

 while that of man varies from 3 Ibs. 2 oz. to 4 Ibs. 

 6 oz. Yet the muscular power of the horse is 

 equal to that of six men. Besides, if the brain 

 were the source of vital energy, such men as 

 Bacon, Shakspeare, Newton, Milton, Franklin, 

 Napoleon, Byron, and all others that have large 

 heads, ought to possess the energies of life in the 

 highest degree ; whereas it is certain, that, in 

 men of genius, the powers of digestion, secretion, 

 nutrition, and muscular motion, are generally in- 

 ferior to what they are in individuals of the 

 athletic temperament, who are often remarkable 

 for the smallness of their heads, and a deficiency 

 of intelligence. 



According to Rudolphi, the brain of a full- 

 grown Greenland whale, (Balena Mysticetus,) 

 seventy-five feet long, weighs only 5 Ibs. 10 oz. 

 4 drs. But as the cetacea have large lungs, and a 

 temperature that varies from 100 to 104, with a 

 corresponding amount of rich red blood, the mus- 

 cular power of the whale is equal to that of several 

 hundred men. John Hunter states, that, from the 

 capacity of the heart and aorta, from 80 to 120 

 Ibs. of blood must be discharged by the left ven- 

 tricle at each contraction. The weight of this 



