476 
REVIEW. 
ing nervous energy to the whole of the viscera. 2nd. They send off large 
nerves to the strong muscles of the back and loins, and to the cutaneous 
surface. 3dly. The hind extremities derive the whole of their nerves from 
them. The greater part of the first dorsal nerve goes to the formation of 
the cervical plexus, from which nervous agency is transmitted to the fore 
extremities.” 
* * * * # 
“ The hair on the fetlock, like the mane springing from the neck, may 
possibly be regarded as a necessary appendage of the horse. Arguing on 
this view we might ask : if necessary, and, consequently, instrumental to 
some valuable purpose, how does it happen that man has the power of 
preventing its growth ? It substantially disappears, when care and judg- 
ment are bestowed in the breeding of the animal. The race-horse, and the 
thorough-bred hunter, display it in its lowest degree. In them it is absent, 
as compared with its imposing form in the heavy dray or common draft 
horse, in which, from its profusion, it nearly covers the foot.” 
* * * * * 
“ The hair on the fetlock is found in greatest affluence in the heavy dray- 
horse. The form of the animal is well known. His large proportions in all 
directions are familiar to ordinary observation. The body is considerable in 
bulk, and the limbs are correspondingly developed. His step is slow, but 
indicates power. His strength is great. 
“ Of late years the study has been, in the breeding of this description of 
animals, to modify the combination of his qualities. To obtain greater com- 
pactness of bone and muscle, and to impart to them greater facility of 
action. In other terms, the object has been to change the character of the 
nervous system .” 
Three causes are specified as producing diseases in those 
parts, denominated grease , cracks , ulceration , and fungous 
excrescences . 
“ 1st. The growth of it (hair) is upon, and in the vicinity of, a large joint, 
and the last of the limb. 
“2dly. The structures where it appears are extremely vascular. The 
blood-vessels assume in them a remarkable arrangement previous to their 
termination in the foot, the physiological conditions of which we shall sub- 
sequently touch upon. 
“3dly. In connexion with the pecularities mentioned, is the important 
fact, that the weight of the body is thrown upon the pastern joint and its 
contiguous structures, exciting the nervous and vascular actions natural to 
them ; and proportionately aggravating the necessity for issues to facilitate 
the escape of superfluous chemical elements.” 
The reasons are then assigned why morbid affections pre- 
sent different characters in the race- and dray-horse. 66 In the 
race-horse they generally display acute inflammatory symp- 
toms, soon run their course, and end fatally, if not checked 
by prompt and active means.” 
To this succeed the causes of the development of horns in 
ruminating animals. These, too, are stated to spring from 
