LETTER FROM MR. PRITCHARD TO MR. PERCIVALL. 317 
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forcing open the door he got into the yard and galloped round it 
once. He was now almost unconscious, and the man drove him 
quietly into his box, where he had not been many minutes before 
he died. 
25th . Post-mortem appearances .— The intestines healthy, 
their contents semifluid — the stomach free from disease, — its 
contents fluid — the liver of a clay yellow- like appearance — the 
lungs patchy, and having a peculiar inflammatory blush — a coa- 
gulum in the right and left ventricle of the heart. The internal 
structure of the heart presented a modena or deeper red than is 
usual. 
I now come to that which induces me to form a more confirmed 
prognosis ; namely, the extensive inflammation of the larynx 
with considerable ecchvmosis on the epiglottis and rima-glqttidis 
and extending to the pharynx, the dorsum of the tongue being 
almost blackened. In the brain there was slight congestion on 
the meninges, and most so on the right lobe, their internal sub- 
stance, however, being free from disease. 
A LETTER FROM MR. PRITCHARD TO MR. 
PERCIVALL ON THE EXISTENCE OF A PISI- 
FORME BONE IN THE HORSE’S KNEE. 
Dear Sir, — I trust you will pardon my calling your attention 
to an error in your description of the horse’s knee. Now that 
non-veterinary practitioners are ascertaining the value of our 
tactics, it is necessary we should be correct, if possible, in all we 
say about the horse. 
In your work, published in 1823, you state the carpus to be 
composed of eight bones ; and as Professor Coleman, in his 
lectures, described the knee as possessing eight bones, I con- 
cluded that you followed his description, and that, by this time, you 
had discovered the error, and so passed it over; but I find you, 
inTHEV ete rina rian, still committing the same error. Professor 
Coleman called the quadrangular bone at the back of the carpus 
the os pisiforme ; and a second, also behind, and at the posterior 
part of the os trapezoides, a small pea-shaped bone, was the tra- 
pezium. You have very properly given the name trapezium to 
the large quadrangular bone, and afterwards describe the pea- 
shaped bone at the back of the os trapezoides as the os pisiforme, 
making up, with the three bones in each row, eight bones. You 
VOL. xvi. u u 
