Nevertheless, even in this case,
we must not overlook the indirect effects of habit on the heart,
as we shall see when we consider the signs of rage.
When a man suffers from an agony of pain, the perspiration
often trickles down his face; and I have been assured by a
veterinary surgeon that he has frequently seen drops falling
from the belly and running down the inside of the thighs
of horses, and from the bodies of cattle, when thus suffering.
He has observed this, when there has been no struggling
which would account for the perspiration. The whole body
of the female hippopotamus, before alluded to, was covered
with red-coloured perspiration whilst giving birth to her young.
So it is with extreme fear; the same veterinary has often
seen horses sweating from this cause; as has Mr. Bartlett
with the rhinoceros; and with man it is a well-known symptom.
The cause of perspiration bursting forth in these cases is
quite obscure; but it is thought by some physiologists to be
connected with the failing power of the capillary circulation;
and we know that the vasomotor system, which regulates
the capillary circulation, is much influenced by the mind.
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