sacrifices compared with the lot of his fellow-men. A post mortem showed
plainly that both apices of the lungs had been diseased.

There are many cases, of which no knowledge exists outside of a small
circle, of restored health, though with impaired power of respiration
and consequent endurance of great hardships, which latter, of course,
must be entirely avoided by those thus situated. There is, too, even
greater liability to a fresh attack than with persons who have never
been afflicted, but the vigilance necessary to maintain health fortifies
against its repetition.

One of the essentials in effecting a cure is FRESH AIR; and if this can
be had in such form as to give more of oxygen--the vital element--than
is usually found, the healing processes must be accelerated, beyond
doubt. The family physician will tell you this. Now, under what
circumstances is a larger amount of oxygen found? What climate affords
most, all other things being equal? It certainly is not a _hot_ climate,
nor a variable moist one such as prevails all over the consumptive
district which we have indicated at the beginning of this chapter. It is
found in a cool, dry climate, and this condition is had in Minnesota
with greater correlative advantages than in any other section of the
Union known up to this time. The atmosphere is composed of two gases,
oxygen and nitrogen, and in every one hundred parts of common air there
are about seventy-five parts of nitrogen and twenty-five of oxygen,
subject to expansion from heat and of contraction from cold. This
accounts in part for the general lassitude felt in a warm atmosphere,
while a corresponding degree of vigor obtains in a cold one. The
condensation, the result of a cool temperature, gives to the lungs a
much larger amount of oxygen at a single inspiration, and, of course,
for the day the difference is truly wonderful. The blood is borne by