he becomes acclimated and is able to withstand
the cold without serious discomfort. Likewise
the inhabitant of a cool climate feels exhausted

by the heat of the torrid zone. In some cases
he is unable to accustom himself to the change,
but in many instances the acclimatization
follows rapidly and leaves the individual well
fortified against the dangers of excessive heat.

Persons who have accustomed themselves
to stimulants of any sort are completely depleted
if they are unable to get the special
form to which they have been accustomed.
This holds true for tobacco, morphine, coffee,
and many other forms of stimulants actually
indulged in by many persons. If they are
able to resist the temptation and deny themselves
the stimulant, the period of exhaustion
soon disappears and the subject may even lose
all craving for that which formerly seemed
essential to his very existence.

The quantity which we eat is partly a
matter of habit. There is doubtless a minimum
of nourishment which is absolutely necessary
for health and strength. On the other
hand there is doubtless a maximum limit
which cannot be passed without serious injury.
Our bodies seem to demand the amount of