by the stimulus of the spur, added to the proper management of
the bit, he may be put so much upon his mettle, that he would
appear to a standerby, as fresh and as high spirited as if he had
not gone a mile. Nay, probably, the horse himself, while in the
heat and passion occasioned by this stimulus, would not feel any
fatigue; but it would be strangely contrary to all reason and
experience, to argue from such an appearance that, if the
stimulus were continued, the horse would never be tired. The cry
of a pack of hounds will make some horses, after a journey of
forty miles on the road, appear as fresh, and as lively, as when
they first set out. Were they then to be hunted, no perceptible
abatement would at first be felt by their riders in their
strength and spirits, but towards the end of a hard day, the
previous fatigue would have its full weight and effect, and make
them tire sooner. When I have taken a long walk with my gun, and
met with no success, I have frequently returned home feeling a
considerable degree of uncomfortableness from fatigue. Another
day, perhaps, going over nearly the same extent of ground with a
good deal of sport, I have come home fresh, and alert. The
difference in the sensation of fatigue upon coming in, on the
different days, may have been very striking, but on the following
mornings I have found no such difference. I have not perceived
that I was less stiff in my limbs, or less footsore, on the
morning after the day of the sport, than on the other morning.

In all these cases, stimulants upon the mind seem to act
rather by taking off the attention from the bodily fatigue, than
by really and truly counteracting it. If the energy of my mind
had really counteracted the fatigue of my body, why should I feel
tired the next morning? if the stimulus of the hounds had as