THE GEOLOGICAL HISTORY OF THE HORSE. 
25 
Upon cutting into the tumour after its abscision, it presented a 
solid body of red and white interspersed, which gave it a striated 
appearance, not very unlike the arbor vitae of the cerebellum. 
On the 29th of August in the same year, he was again brought 
to me ; the tumour in the neighbourhood of the sheath having al- 
most imperceptibly grown as large as a cocoa-nut, and become very 
painful, so much so that the animal would not allow it to be touched. 
It made him kick tremendously whenever they were cleaning him. 
To cure him of that vice, which the owner was afraid of his con- 
tracting, its removal was decided upon ; and, accordingly, that day 
week, on the 5th of October, I cast him, and found the tumour cor- 
respondent in all things (except being highly sensible) with that 
which was taken from the shoulder ; and being perfectly ignorant 
as to the true nature of the tumour, it was removed in an exactly 
similar manner. 
Fearless of consequences, I did not see him again until the 19th. 
Instead of the wound having healed as kindly as it had done after the 
first operation, my astonishment may be faintly imagined but cannot 
be expressed, when on a cursory glance I found a tumour in the 
same situation, but four or five times the size of the original one. 
Upon a closer inspection I discovered it to be the cyst, with its 
edges everted, its fundus protruding downwards; and I cannot con- 
vey to you or your readers a more perfect resemblance of what it 
presented than by comparing it to an inverted uterus, which most 
of us have seen. The discharge from the wound was of a bloody 
serous nature ; very great, and highly offensive. 
A solution of the chloride of lime was applied to it frequently 
during the day, but he died on the 22d. I very much regret that 
I had not an opportunity of seeing him after death. I must not 
omit to state, that the tumour in the neighbourhood of the sheath 
existed at a year old, at which time it was noticed by the person 
who castrated him; but it size then did not exceed that of a pigeon’s- 
e gg- 
THE GEOLOGICAL HISTORY OF THE HORSE. 
By Mr. W. C. Karkeek, V.S., Truro. 
To trace the history of remote events, and to investigate the 
origin of our domesticated animals, has given occupation to the 
highest talents; and in this interesting inquiry, mouldering records, 
decaying monuments, fabulous legends, and the sibylline leaves 
of tradition, have yielded their respective tributes. But still the 
details, even of probable history, carry us back but a little way 
VOL. XIV. D 
