DIPSOSIS AVENS IN THE HORSE. 
683 
and jumping whilst being led by the side of another horse, he 
produced some disarrangement of parts in or near the neck of the 
bladder, from which he has never perfectly recovered. There 
began from that time, and has still continued to exist, a slight 
draining of urine occasionally by the urethra. There appears to 
be a partial power, however, to restrain this, as frequently there 
will be no discharge of this kind whilst he is being either ridden 
or driven a stage of several miles, but which will commence as 
soon as he stands still. I suspect that on this particular occasion 
a rupture of the scarcely closed wound in the neck of the bladder 
took place afresh, and that it has now either healed again, with 
some loss of power in the sphincter muscle, or that a scirrhous 
opening in or near it still remains, which the muscle has the 
power of closing on particular occasions, but that it does not 
exercise that invariable vigilance which is required to prevent a 
trifling escape at other times. 
His natural evacuations of urine are considerable in quantity, and 
this trifling escape has never interfered with his general health or 
his usefulness, as he has since been in most beautiful condition, 
and has done his work with apparent ease and great cheerfulness. 
Mr. Windle has kindly presented the calculus to the museum 
of the Veterinary College, London. 
A CASE OF IMMODERATE THIRST (DIPSOSIS 
AVENS) IN THE HORSE. 
By Mr. Edward Charles, London. 
In the beginning of June last, I was sent for to look at a 
horse that, for three or four days, had been suffering from 
unquenchable thirst, drinking seven or eight pails of water daily, 
without being satisfied, and voiding an equal quantity of urine. 
He was a fine bay carriage horse, and, some weeks before, had 
two doses of physic, the last of which had little or no effect. 
I found his pulse rather lower than usual, his mouth cool, appe- 
tite diminished, and rather tucked up in the flanks. His hind 
legs, which previously were a little dropsical, were as fine as 
possible, much more so than I had ever seen them ; his coat 
looked healthy, he was in high spirits, but, although he had 
worked as usual since he drank so much, he had never perspired : 
he was also rather costive. 
His attendant was doubtful whether he had done right in 
giving him so much water: I, however, recommended that he 
should have as much as he would drink. I gave him a fever ball, 
and ordered him green meat instead of hay. 
