270 OBLITERATION OF THE LEFT KRACHIAL ARTERY, 
anatomy has failed to discover any defect in the generative 
organs of either sex. 
2dly. That the she-mule, sometimes, admits of impregnation 
by the horse or ass, though this constitutes hut an extremely 
rare exception; the reason of which, probably, may be less diffi¬ 
cult to find out than the fact even of its infecundity. 
To which we may add,— 
That such adulterous unions between horse or ass and she- 
mule, destroying, as they do, the characteristics of the mule, 
would be sure to result, through the parents with the offspring 
or through the offspring between themselves, in a return after 
several generations to products of the primitive type, that is to 
say, to the horse and the ass. 
Journal des Veterinaires, Ibre, 8 bre, et 9bre, 1851. 
OBLITERATION OF THE LEFT BRACHIAL ARTERY 
AND ITS BRANCHES, PRODUCING INTERMITTENT 
LAMENESS IN THE HORSE. 
An entire horse, suited for heavy draught, eleven years old, 
was admitted into the College on the 14th of July, and destroyed 
on the 25th of the same month. 
This horse was purchased on the 14th of June of a dealer in 
Paris, and immediately put to work, exhibiting all the signs of 
health. Eight days afterwards, with a heavy carriage to draw, 
after having trotted about twenty minutes, he fell suddenly lame 
in the near fore leg. No cause for the lameness was dis¬ 
coverable. He was rested for some days, and the lameness 
disappeared. He was put to work again, but this time was not 
driven out of a walk; when the lameness did not recur. 
On the 6th of July, after another rapid trot for about twenty 
minutes, he fell lame a second time, as he had done before. 
This time, however, the driver, instead of taking any heed of it, 
drove him on even at a faster rate. He had hardly advanced 
160 yards further, however, than he stopped all at once and 
fell down in the shafts. When led to his stable, he appeared 
in great pain, as though he were “ griped.” A veterinarian was 
called, who bled him, and in a quarter of an hour he was all 
right again. 
Several similar attacks were subsequently experienced: in 
fact, according to his owner’s account, it only required trotting 
for fifteen or twenty minutes at a time to induce one. 
On his admission into College, the 14th July 1851, 
