612 
ON ANIMAL HEAT. 
the man, got him down, and was on the point of tossing him with 
his horns. This ever-to-be revered and celebrated beast, seeing 
what was passing, set off at speed to the scene of action, not to 
assist the monster in the bloody work he had begun, but to the 
aid of the defenceless man within his grasp. Feeling confident 
in his power, he charged the ferocious brute, and was instantly 
victorious. The man, during this conflict, lay prostrate in a state 
of fear and insensibility. On a return of his faculties he found 
himself still within the reach and power of a bull, but not the 
vicious beast that had first assailed him, but his fellow-slave, 
who, after his victorious conflict with the monster, had returned 
to him, and, in order to pacify him and convince him that he had 
not any thing to fear, the docile creature began to lick him. The 
man soon perceived it was his old friend, and got up and heaped 
on him a load of caresses, and returned to his usual occupation 
without much injury. 
ON A REMARKABLE PROPERTY OF ARTERIES 
CONSIDERED AS A CAUSE OF ANIMAL HEAT. 
By J. M. Winn, M.D., Tryro. 
Dear Sir, — I n The Veterinarian for October, I find an 
article on Animal Heat, in which the writer has brought for- 
ward as his own some views of mine, with regard to elasticity 
being a source of animal heat, which I published in the Philoso- 
phical Magazine as far back as March 1839. I shall, therefore, 
feel obliged by your republishing the following account of my 
experiments and theory as they appeared in the latter Journal. 
I am, dear Sir, your’s truly. 
To Mr. Karkeek, 
Joint-Editor o/’The Veterinarian. 
“ About three years since, while making a few experiments on 
caoutchouc, I was forcibly struck with the property it possesses 
of evolving heat when suddenly stretched, and was led at the 
time to infer the probability of other bodies being similarly en- 
dowed. The elastic coat of arteries, especially, from the mecha- 
nical resemblance it bears the caoutchouc, appeared to be one of 
the substances most likely to exhibit this calefactory principle ; 
and, in the event of this being the case, it would not be unrea- 
sonable to conclude that the incessant contractions and dilata- 
tions of the arteries during life must form an efficient source of 
animal heat. 
