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How the Heart Valves may be Injured. The valves of the heart are likely to give way, partly because they are under such constant strain, snapping backward and forward day and night; and partly, because, in order to be thin enough and strong enough for this kind of work, they have become turned, almost entirely, into stringy, half-dead, fibrous tissue, which has neither the vitality nor the resisting power of the live body-stuffs like muscles, gland-cells, and nerves.
We have discovered, by half a century of careful study in the hospital and in the sick-room, not only that the nerve-tissues are usually poisoned by defect of other tissues of the body, but that they are among the very last of the body-stuffs to succumb to an intoxication. The complications of a given disease involving the nervous system are almost invariably the last of all to appear.
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