DISEASE OF MEMBRANES COVERING BRAIN OF A DOG. 365 
in this organ than in any other portion of the archi- 
tecture of the animal body. Every possible device would 
appear to have been resorted to in order to secure strength, 
solidity, elasticity, and smoothness of movement by the 
mutual dependence, or rather adaptation, of one part to 
another; the parts in front being closely connected with 
those behind, and both deriving additional power and assur- 
ance from each other. All has been wisely planned, even to 
the most minute detail. 
To give but one instance, we might refer to the capsules 
which I have noticed as encircling the joints like so many 
sacs, and which are lined by the delicate membrane that 
supplies the indispensable lubricating fluid. In certain move- 
ments of the limbs portions of these sacs become flaccid, and 
in this condition would be liable to fall inwards between the 
bones forming the joint, when they would sustain serious 
injury, or even destruction. To obviate this accident, how- 
ever, the capsule is made to adhere slightly on its outside to 
one or more of the tendons passing over it, and these when 
in motion pull it sufficiently tense to keep it out of the way 
of danger. A similar arrangement is conspicuous with 
regard to the sheaths of tendons, to prevent their ruffling and 
becoming inflamed or lacerated during violent or sudden 
movements. 
EXTENSIVE DISEASE OF THE MEMBRANES 
COVERING THE LEFT HEMISPHERE OF THE 
BRAIN OF A DOG. 
By Messrs. Gowing & Son, M.R.C.V.S., Camden Town. 
History . — On the 2nd inst. our attendance was requested 
at Brook Street, Grosvenor Square, in respect of a white 
terrier dog eighteen months old. The history of the case is 
as follows : — 
The owner stated that the dog had been brought from 
Oxford, and that he had recently lost his vision. On exa- 
mination it was found that the pupils of both eyes were 
somewhat dilated, and there was no power of recognising 
objects ; the other special senses did not appear to be inter- 
fered with, as the dog recognised his master's voice, and 
would come to him when called ; this he would do slowly 
and carefully, apparently using his sense of smell as his 
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