STUDIES ON HAIR

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Abstract
VII. HYPERTRICHOSIS Hypertrichosis, in common with some other forms of aberrant hair growth, is undoubtedly due to a variety of different causes. Like alopecia, it may be present at birth, or may appear at any subsequent period of life. But unlike alopecia, it is probably never directly induced by any pathogenic organisms, and it is probably correct to state that there is as yet no satisfactory evidence that it can be induced by external factors. That there may be predisposing external causes cannot be denied, and every effort should be made to establish the fact of their existence, but in the light of our present knowledge hypertrichosis seems to be preeminently a matter of constitution. And so it becomes a question of interpreting hypertrichosis in terms of variation in the complex of factors which usually result in ordinary hair growth. To this end, studies directed at an understanding of the

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