102 
ROBERT DICKSON. 
The neuroglia cells persist however, and there is a moderate 
exudation of leucocytes, which are scattered about in small 
groups. In this marginal zone the walls of the small vessels 
are generally infiltrated with leucocytes and round cells—they 
are often occluded by hyaline thrombi—others are distended with 
blood, which also fills and widely dilates the surrounding lymph 
sheath, often breaking through and lying in the tissue. Such 
areas, densely infiltrated with extravasated blood, are very nu¬ 
merous and correspond with the haemorrhages so conspicuous 
macroscopically. As we pass toward the centre of the lesion 
the brain substance disappears entirely and is replaced by a 
granular pink-staining debris interspersed with a clear homoge¬ 
neous material which stains pink and is very highly refractive. 
This, the gelatinous material described above, gives only the 
general micro-chemical reactions of hyaline bodies. 
Bacteria were searched for in the sections with negative re¬ 
sults, and cultures from the fresh brain as well as inoculations 
of the softened material into animals were similarly negative. 
The fifth brain, that of the “ dummy,” presented on section 
a greyish, translucent ramifying scar in the substance of the 
anterior cerebral lobe on one side—microscopically showing 
only a loose fibrous tissue ; this was evidently a healed lesion. 
From these cases it would seem that we are justified in con¬ 
cluding that the disease recently so prevalent is an enzootic 
form of acute haemorrhagic encephalitis rather than cerebro¬ 
spinal meningitis. 
TARSAL TENOTOMY. 
By Robert Dickson, D. V. S., New York City. 
Read before the April meeting of the Veterinary Medical Association of New York 
County. 
It is not with the idea of presenting to you a new operation, 
nor a specific in the treatment of exostosis of the hock, but to 
present an old operation which has been abused in the past, and 
is now considered by the majority of practitioners as a useless 
