The individual weakened by a tuberculous infection can
frequently, by following a prescribed regimen for a time, by wise,
scientific diet and rest treatment and the help of the out-of-doors,
then by carefully increased physical activity, finally live the useful,
average life. But it takes scientific care to evolve the weak body into
a strong one; and in some cases, at best, it can never stand the same
strain that the uninjured one carries with ease. However, even damaged
bodies can be made very productive within their limited spheres. Also
the naturally perfect physique can quickly become unfit through neglect
or infections or misuse.
In the same way, and just as definitely, can the mind be developed and
strengthened. Some are by nature keen, alert, brilliant. They may
develop into masterfulness; or they, too, may degenerate, through abuse,
or from the effect of body infections, into uselessness. The germ-plasm
has foreordained some individuals to psychic disorders; but training and
mode of life can modify many of these defects.
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