[21]
Again, the presence of some obstacle may
divide the breath just as a pebble will divide shallow
waters, which, although their currents unite again
soon after the obstruction is past, still leave a hollow
space in rear of the object struck. An excess of
moisture also impedes the voice, while a deficiency
weakens it. As regards fatigue, its effect is the same
as upon the body: it affects the voice not merely at
the moment of speaking, but for some time afterwards.
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