272 OBLITERATION OF THE LEFT BRACHIAL ARTERY, 
limb began to recover its mobility, insomuch that in half an 
hour the animal presented once more all the appearances of 
health. Indeed, to look at him an hour afterwards, so com¬ 
pletely had he recovered himself, that one might have doubted 
he was the same animal. 
After a repose of two hours he was submitted afresh to the 
same trial as before. As on former occasions, on setting out he 
went perfectly sound; though four minutes had hardly passed 
under exercise before he commenced shewing lameness, feebly 
at first, but gradually increasing until the near fore leg, as be¬ 
fore, had become incapable of being set down. This exertion 
was followed, under rest, by the same phenomena as before ; 
though it was remarked that the return to regularity of the 
functions occupied a longer time than it had formerly done. 
DIAGNOSTIC. —Obliteration of the principal arterial vessels 
of the near fore limb, a diagnostic founded upon the following 
indications:— 
lstly, Upon the intermittence of the symptoms. —So long as 
the circulation is slow, the small arteries, collateral to the ob¬ 
literated trunks, prove equal to convey to the muscles what 
blood is requisite for their sustention of contractility. But 
from the moment such contractility is put into action, and under 
exercise continued in it, these organs no longer receive the 
amount of blood they require for their stimulation, and in con¬ 
sequence experience a sort of momentary paralysis for want of 
such due stimulation. 
2dly, The abatement , after exercise, of the temperature of 
the lame limb. —This is the indication of the limb no longer 
receiving its normal quantity of blood, the consequence whereof 
is, the molecular combinations, of which contraction and the 
development of caloric are the effect, are no longer duly carried 
on within the substance of the muscles. 
3dly, The absence of all appreciable alteration to which 
such symptoms as have been detailed could be referred, added 
to the insufficiency of any lesion , save the obliteration of the 
vascular orgasm, to account for them. Any lesion of the prin¬ 
cipal nervous chords of the limb would give rise to a settled 
paralysis , and not to any intermittent affection, as in the case 
before us; while any muscular alteration would likewise 
produce continued symptoms and not intermittent ones. 
3dly, Certain similar cases of lameness, observed in former 
times, and recorded in veterinary annals, stand in confirmation 
of such diagnostic inductions. M. Bouley, junior, in 1825, 
published a case wherein, after a certain length of exercise, 
symptoms made their appearance—first, of excessive lameness 
in the hind limbs, afterwards of absolute inability of motion, to 
