CENTRAL VETERINARY MEDICAL SOCIETY. 6i 
exhibiting a large tumour upon the choroid plexus within the 
left ventricle, and the advanced formation of a second within the 
right cavity. The animal, an aged gelding, was in perfect health 
up to one week prior to his death, and had been ridden regularly 
to hounds, as well as in the park, &c., by a lady, and throughout 
the course of his life had never shown any signs of disorder or 
interference with the functions of the nervous system. On the 
day when attention was first directed to him, he had reared 
violently while being saddled, and fell backwards in the stall, 
after which disease of the brain became daily more pronounced, 
and it was determined to have him destroyed. Mr. Field con¬ 
sidered the occurrence of such disease to be unusual, when 
animals so affected were able to continue their work and appear 
in perfect health, and at the same time afforded no means of 
providing relief by treatment. 
The Secretary stated that horses were more frequently affected 
in the manner shown by the morbid specimen before the meeting 
in the North of England and Scotland. Vertiginous signs, 
known as megrims, are usually associated, which have caused 
such animals to be called “ shiverersP In consequence of the 
frequency of the disease in horses, the late Professor Dick 
treated the subject in a special manner in his lectures. He 
(the secretary) had known horses so affected to live, and work 
well for years; but, gradually getting worse, would eventually 
die in one of the severe convulsive fits, or so injure themselves as 
to become useless, when they were destroyed. 
Mr. F. J. Mavor exhibited a specimen of lacerated tendon, 
upon which ossific deposit had formed. Previous disease had 
also been set up by the insinuation of thorns within the substance 
of the tendon, and the specimen became doubly interesting, as 
well as showing the nature of the lesion and mode of reproduction 
of substance. 
Two specimens of nervous structure showing perfect reproduc¬ 
tion after division and abscission, were also produced—one the 
nerve restored, and the second a prepared section for examination 
under the microscope, in which the true nerve-structure could be 
distinctly recognised in the new formed material. Mr. Mavor 
said this had been carefully dissected from the leg of a horse 
which had been unnerved for lameness of the foot. At the time, 
and for two years after, the operation enabled the animal to travel 
with perfect freedom from suffering, and at length, sensation 
returning, he was destroyed. The occurrence was attributed to 
the reproduction of nerve substance, which after death was found 
to be correct. 
Mr. W. Field, jun., said he had found the same take place in 
horses he had unnerved, and upon which he always operated again. 
