Muscles do not use oxygen at a constant rate.
The absorption of oxygen and the elimination of carbon dioxide in the lungs take place by diffusion alone. There is no trustworthy evidence of any regulation of this process on the part of the organism.
The theory of the lung as a gland has justified its existence and done excellent service in bringing forward facts, which shall survive any theoretical construction that has been or may hereafter be put upon them.
We may fondly imagine that we are impartial seekers after truth, but with a few exceptions, to which I know that I do not belong, we are influenced-and sometimes strongly-by our personal bias; and we give our best thoughts to those ideas which we have to defend.
In man, the mechanical breathing is essential to life, and it is one of the old tests for death to see whether these movements have ceased completely.
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