"Recent pamphlets lay the blame of all the bad effects of anthracite
furnaces and stoves to the carbonic oxide mingled in the air. I think
these pamphlets have a bad influence. _Excessive dryness_ also has bad
effects. So also the excessive heat in the evenings and coolness in the
mornings has a share in these evils. But how much in addition is owing
to carbonic oxide, we can not know, until we know something of the
actual amount of this gas in rooms, and as yet we know absolutely
nothing definite. In fact, it will be a difficult thing to _prove_."
There are other difficulties connected with furnaces which should be
considered. It is necessary to perfect health that an equal circulation
of the blood be preserved. The greatest impediment to this is keeping
the head warmer than the feet. This is especially to be avoided in a
nation where the brain is by constant activity drawing the blood from
the extremities. And nowhere is this more important than in schools,
churches, colleges, lecture and recitation-rooms, where the brain is
called into active exercise. And yet, furnace-heated rooms always keep
the feet in the coldest air, on cool floors, while the head is in the
warmest air.
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