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Hair represents an expendable, transient substance, proliferated in the skin by a remarkable complicated cellular system. It has been studied extensively, particularly in fur-bearing or wool-producing mammals. Now, more attention is being given to hair in man. Whole industries have waxed and waned around the styles of hair dress, of wigs, of fashions in cutting hair or letting it grow long. Hair dying not only has added to what milady thinks is real beauty but has introduced a new array of possibly toxic and harmful agents, occasionally causing distressing, spectacular, and sometimes dangerous forms of sensitivity. This book approaches the biology of hair from many different directions. It ranges over embryology, anatomy, histochemistry (including electron microscopy), the details of mitotic activity in the hair follicle, the chemistry of keratinization, the problem of hair pigment, the skin, its vascularity and their relationship to hair growth, nutritional factors, hormonal factors, age,
Bean WB. The Biology of Hair Growth.. AMA Arch Intern Med. 1960;105(6):974-975. doi:10.1001/archinte.1960.00270180152021