Sir J. Paget has given a curious instance
of the power, not indeed of the mind, but of the nervous system,
on the hair. A lady "who is subject to attacks of what is called
nervous headache, always finds in the morning after such an one,
that some patches of her hair are white, as if powdered with starch.
The change is effected in a night, and in a few days after,
the hairs gradually regain their dark brownish colour.[43]
[40] Dr. Maudsley has given (`The Physiology and Pathology of Mind,'
2nd edit. 1868, p. 105), on good authority, some curious statements with
respect to the improvement of the sense of touch by practice and attention.
It is remarkable that when this sense has thus been rendered more acute
at any point of the body, for instance, in a finger, it is likewise improved
at the corresponding point on the opposite side of the body.
[41] The Lancet,' 1838, pp. 39-40, as quoted by
Prof. Laycock, `Nervous Diseases of Women,' 1840, p. 110.
[42] `Chapters on Mental Physiology,' 1858, pp. 91-93.
We thus see that close attention certainly affects various parts
and organs, which are not properly under the control of the will.
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