Chapter 5.—Examination of Victor’s Simile: Does Man Give Out Nothing by Breathing? Prove now yourself what I say, for your own satisfaction in your own case; emit breath by exhalation, and see whether you can continue long without catching back your breath; then again catch it back by inhalation, and see what discomfort you experience unless you again emit it. Now, when we inflate a bag, as you prescribe, we do, in fact, the same thing which we do to maintain life, except that in the case of…