Summary

Emil Behnke The Mechanism of the Human Voice

The lungs, as we have seen, are the bellows of our vocal organ; they supply the air which is the motive power on which the voice depends. Without air no tone can be produced. Nay, more, life itself must cease without it. Breathing goes on regularly while the voice is silent; but in speaking and singing both inspiration and expiration have to be regulated according to the nature of the phrases to be spoken or sung. If the speaker does not know how to take breath and how to control the expiration, his delivery will of necessity be jerky and uncertain.
Source: Gutenberg

Emil Behnke The Mechanism of the Human Voice

The tones sung by inspiration are, as might be expected, wholly devoid of beauty, because the vocal apparatus is, as it were, put upside down, and the position of bellows and resonator reversed. But that does not alter the question. The fact remains, and clearly proves that the pockets have no more to do with the falsetto than with the chest voice, because in inspiration the air strikes the vocal ligaments after it has passed the pockets, and yet the result is, beauty of tone apart, exactly the same.
Source: Gutenberg

Emil Behnke The Mechanism of the Human Voice

But complete [27] inflation, or, "full breath," is not the work of a moment; it takes time, and must be done gradually, steadily, and without the slightest interruption. This should always be done through the nostrils. The mouth was never intended for breathing, while the nose is specially and admirably adapted for this purpose. Not only can the lungs be well and quickly filled through this channel, but it is so cunningly devised that it acts at the same time as a "respirator," both purifying and warming the air before it touches the more delicate parts of the vocal organ.
Source: Gutenberg

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