STUDIES ON HAIR

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Abstract
The production of hair is one of the fundamental characteristics which differentiate the mammals from other classes of vertebrates. Hair is as peculiar to the mammals as feathers are to the bird. It is present and, with few exceptions, well developed in every member of the class, while it is entirely lacking in all other vertebrates. It was a recognition of the value of hair from the systemist's standpoint that lead Oken to propose the termTrichozoa—hair animals—for his highest class of vertebrates. Although Oken's term never came into general use, the fact remains that it is as descriptive of the class as is the wordMammalia,1which supplanted it. It is natural that a character so distinctive and of such morphologic importance as mammalian hair should attract the attention of many investigators. During the period of intense morphologic interest, which extended through the last decades of the

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