236 
EXTRACTS FROM FOREIGN PERIODICALS. 
are affected as when the trouble is unilateral. It causes no« 
discomfort to the animal, and does not prevent him from 
lying down.— Ibid . 
✓ • f j 
DIABETES MELLITUS IN A HORSE. 
By Thomas Wallet, M.R.C.V.S., Principal of the Royal Veterinary College, 
Edinburgh. 
While diabetes insipidum (polyuria) is of very common 
occurrence in the horse, the graver form (d. mellitus) is very 
rarely met with, or perhaps it would be more correct to say 
that it is seldom diagnosed ; consequently, the relation of an 
indubitable case may be of interest to the veterinary surgeon. 
With the exception of the occurrence of sugar in the urine 
of azoturic patients I have not hitherto met with a case ir 
which I had reason to suspect that sugar was present in thei 
urine. 
On the 6th May, 1891, I was requested by Mr. D. to ex 
amine an aged chestnut hunter, and to give my opinion as 
to his condition. S 
History. —The owner stated that the horse had been il 
for some time, that he had observed that whenever he mount 
ed him the animal seemed to yield under his weight, that al 
though in good spirits at the commencement of his work, tin 
horse appeared to become abnormally fatigued after exertion 
that he had lost condition, and that he had been under the 
care of Mr. John Aitken, Dalkeith. 
Eliminating by enquiry the probabilities that the illnes 
was due to worms, indigestion, or diabetes, I proceeded teji 
make a careful examination. 
The symptoms presented were, unthriftiness of the skin 
which was dry and tolerably firmly adherent to the under, 
lying tissues; the coat dry and harsh ; pulse 60, wanting ij 
tone but regular in rhythm ; temperature 103° F.; respiratioi 
normal; visible mucous membranes injected and somewha 
icteric. 
The muscular wasting was most marked in the lumba 
region. Suspecting renal mischief, I withdrew (and collectec, 
