ANIMAL PATHOLOGY. 
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corpus striatum, on the pons varolii, and in the cerebellum, and 
all on the left side. 
M. Vigney relates another case in which a cure was effected 
by repeated bleeding and purging. In fact, these cases appear 
to be more manageable than those of paraplegia; but if the affec- 
tion is not removed, it usually degenerates into paraplegia before 
the death of the animal. 
Why not hemiplegia in the horse? It would appear singular 
that this should be the most common form of palsy in the human 
being, and so rarely seen in the quadruped, were it not for the 
following considerations. It usually follows apoplexy ; but the 
horse, except from some stolen visit to the oat-bin, or other 
as gross mismanagement, is now rarely apoplectic. That pest — 
staggers in all its forms — which used at times to rage as if it 
were an epidemic, and to sweep away whole establishments, is 
now comparatively seldom heard of. There are, indeed, cases 
recorded of two stallions that became paralytic after covering too 
many mares ; they were, however, apoplectic first, and there was 
probably considerable effusion of blood on the base of the brain. 
This kind of palsy in the human being follows some change 
in the structure or functions of the brain, long visible enough in 
the loss of temper and the decline of intellect ; or it may be attri- 
buted to some moral influence or mental irritation. The horse 
has scarcely brain or intellect enough for this. 
Palsy is produced by some injury inflicted on the brain or its 
membranes ; but the brain in our patients has either a second plate 
of bone of great thickness, or a dense mass of muscle given for 
its protection. 
Palsy in the horse proceeds from injury of the spinal chord, 
and that chord is more developed than in the human being. 
In man the brain may perhaps be averaged at one thirty-fifth 
part of the weight of his body. In the intellectual dog, it can 
be rated at little more than the one hundred and sixtieth part. 
In the horse it is one four-hundredth part only; and in the ox 
one eight hundred and sixtieth. Not only is the bulk of the 
brain smaller in the quadruped than in the human being, and 
therefore less likely to exercise so paramount an influence over the 
chord, but the spinal chord, and especially the inferior or motor 
surface of it, is, compared with the hulk of the animal, very 
much more developed in the quadruped than in the biped. 
The brain of the horse is smaller than that of man ; the spinal 
chord is considerably larger. Compare the relative bulk of 
the brain, and that of the chord in man and the horse: 
compare, also, the full rounded development of the motor co- 
