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thing of the kind. On removing the hands and arms from the water,
the air-bubbles disappeared, but gradually returned on again
immersing those organs. The bubbles were of the size of a pin's
head. On wiping them off, they disappeared, but gradually formed
again." In opposition to the above observations of Magendie and
Girardin, it may be urged that the gas which was developed might
probably have arisen from the decomposition of remnants of food in
the inclosed portion of intestine, or that the portion of gut
becoming distended by peristaltic motion, had imbibed air from the
peritoneal cavity, or from the adjacent portions of the intestinal
canal; and, similarly, the escape of air from the stomach and
urinary bladder, in Smith's case, admits of the same mechanical
explanation as has been given in a previous page. Not so, however,
the escape of air from the skin: the fact that all bodies, when
immersed in water, give off a little entangled air, affords no
explanation of the continuous evolution of gas from the skin:
neither does the accumulation of air occasionally noticed in the
intestinal canal of swine seem to admit either of a mechanical or
chemical solution. If we are asked for the particular causes of
these developments of gas, I confess I can give no satisfactory
reply. No secretion of gases occurs in the human body in a normal
condition; for the development of gas in respiration is a purely
physico-chemical proceeding, and is in exact accordance with the
laws of displacement and diffusion of gases, as has been recently
proved by Valentin and Brunner; and, probably, the same law holds
good for the development of gas through the skin. We can only refer
to the analogical proceeding in fishes, where we find an actual
secretion of gas in the swimming-bladder, and must, for ...
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