The lower we descend
in the animal scale, the more varied we find the functions of the skin to
be, and if in the higher animals much of the complexity has disappeared,
that is only because the specialization of the various skin regions into
distinct organs has rendered this complexity unnecessary. Even yet,
however, in man himself the skin still retains, in a more or less latent
condition, much of its varied and primary power, and the analysis of
pathological and even normal phenomena serves to bring these old powers
into clear light.
Woods Hutchinson (_Studies in Human and Comparative Pathology_,
1901, Chapters VII and VIII) has admirably set forth the immense
importance of the skin, as in the first place "a tissue which is
silk to the touch, the most exquisitely beautiful surface in the
universe to the eye, and yet a wall of adamant against hostile
attack. Impervious alike, by virtue of its wonderful responsive
vitality, to moisture and drought, cold and heat, electrical
changes, hostile bacteria, the most virulent of poisons and the
deadliest of gases, it is one of the real Wonders of the World.
More beautiful than velvet, softer and more pliable than silk,
more impervious than rubber, and more durable under exposure than
steel, well-nigh as resistant to electric currents as glass, it
is one of the toughest and most dangerproof substances in the
three kingdoms of nature" (although, as this author adds, we
"hardly dare permit it to see the sunlight or breathe the open
air").
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