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May 30, 1914


JAMA. 1914;LXII(22):1726-1727. doi:10.1001/jama.1914.02560470026014

The attempt to find an illuminating account of the factors which may modify or determine the growth of hair will usually be a vain one. The older writers, who did not always hesitate to make dogmatic statements when they were required to produce a finished account, sometimes discussed the subject with considerable freedom. Not so the modern scientific author, who realizes that every sentence from his pen is likely to be subjected to the scrutiny and criticism of some one who has studied the topic at first hand. The general descriptions of the processes of growth have been satisfactory with respect to their histology. The hair follicle and its papilla, the proliferation of the cells on its surface, the development of keratin — all of the facts concerning these processes are permanent acquisitions of physiology, but they do not commonly rise to the level of practical problems. Why does or

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