Air is the source of oxygen. A constant supply of oxygen is essential to life. Deprived of air, man dies in a few minutes. Yet, at the time that Graham, Jennings, Alcott, Trall, Gove, Nichols, Taylor and their co-workers labored, they had to fight, not only the ignorance and superstitions of the people, but that of the medical profession as well to secure recognition of the need for fresh air. Through the furnace-heated, carpeted and curtained rooms, whose walls were lined with pictures and on whose floors were arranged fine furniture, there seldom stirred a breath of fresh air. People lived in unventilated homes, slept in unventilated bedrooms, while the sick were denied fresh air upon the order of their physician. Fear of night air, cold. air, damp air and draughts was practically universal. Birds, beasts and savages might live in the open air, but civilized man required the staleness of unventilated households and workshops if he was to maintain health.

Bare the shoulder of a man or bare his thigh and behold the palor of death! Behold the limb of a cadaver! Compare the appearance of the exposed part with that of his face that had the advantage of air and sunshine! What a difference! Man needs that great restorative, the fresh breath of heaven, to fan his brow, to play around his mouth, to enter his lungs, to reach and circulate through the citadel of life, carrying with it all of its invigorating and life-sustaining qualities. It was a long hard battle to get this fact recognized and even yet it is not fully appreciated.