THE DIFFERENT PARTS OF THE BRAIN. 
467 
but one-seventh part of that of the brain ; in the horse and ox 
it is nearly a third ; in the dog it is more than a half; in the hog 
it is more than two-thirds. Notwithstanding this dispropor¬ 
tionate bulk of medullary matter, the brain of the horse, the 
ox, the swine, and the dog, is comparatively less, much less than 
that of the human being. The brain of the dog is scarcely a 
fourth part of the proportionate weight of the human being; 
the brain of the ox is not a twentieth part. Then how is this 
difference made up? Why, in the cortical or cineritious parts: 
that preponderates as much in the human brain as the medul¬ 
lary substance does in the brain of the quadruped. 
The Fiuictions of the Medullary and Cineritious Parts in the 
Human Being and the Quadruped. —Now then, gentlemen, a 
little light begins to break in upon us. In the quadruped the 
medullary portion preponderates ; in the human being, the cine¬ 
ritious. In the former, the senses are acute and the muscular 
power is great; in the other, there is or ought to be a stronger 
mental principle. The hunter will recognize the cry of the 
hounds, and his ears will be erect, and he will be all spirit and 
impatience, long before his rider is conscious of the least sound. 
We soon find in the exercise of our profession, that when all is 
dark and black around us, we can trust to the keener vision of 
our horse, who, if we resign ourselves to his guidance, will carry 
us safely through the intricacies and dangers of the road ; and 
we must have carelessly observed him, if we have not been taught 
that the sense of smell supplies in him the place of the sense of 
touch and the lessons of experience. To this it must be added, 
that in power or quickness of muscular action, according to the 
kind of service that we require, he is all that we could wish. In 
the human being, the senses are comparatively dull and obtuse: 
neither in hearing, sight, or smell, can we vie with the meanest 
brute ; but we have the power of thought to arrange and to 
compare the intimations which our senses afford us; to extract 
from them all that is necessary for our existence and comfort; 
to combine with the impressions that we receive from them 
many an association which renders them productive of intense 
delight; and, best and noblest of all, to make them the founda¬ 
tion of intellectual improvement and moral worth. 
Comparison between the Cineritious and Medullary Substance 
in different Quadrupeds. —Observe these brains—that of the 
horse and that of the ox. The brain of the horse is consider¬ 
ably the larger of the two : its relative weight is nearly double. 
How is this difference made up ? In some parts of the base of 
the brain there is more medullary substance in the ox than 
in the horse: the medulla oblongata is considerably larger; 
