Physical anthropology of the old Americans. Pigmentation; Grey hair; loss of hair

It has been shown that the cuticular scales and medullas of human head hair are directly related to the diameters of the hair shafts in which they occur(l2), as are also these same structural elements in the hair shafts of the infrahomonid mammals(11). Hitherto, no series of samples of human head hair has been systematically examined with the object of endeavoring to determine whether these histologic units bear any relation to the age of the individual. Accordingly, in this study the writer presents the results of the examinations of head-hair shafts from individuals ranging in age from three hours to ninety-one years, examinations involving the micromensuration of the hair-shaft diameters and the cuticular scales, and the ocular determination of the morphological types of the medullas.Three hair shafts were selected at random from each individual sample. Inasmuch as the diameter of a hair shaft may vary from the base to the tip and since the form of the medulla and of the cuticular scales varies with the diameter, it was essential that all measurements of scale width and '

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Classifications of hair color

Trotter

1939

American J Phys Anthropol

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The Anthropometric Committee of the American Association of Physical Anthropologists ( HrdliEka, '36) has included in the list for special preliminary survey the following item: "Hair Color. It is desirable that everything relating to the classification and nomenclature of the color of human hair be gathered from the literature and presented in suitable form. (This exclusive of hair-color standards.) " The color of the hair has been determined almost invariably by subjective analysis with only an occasional effort to arrive at a method with an objective approach. This has caused obvious difficulties since the same name has been frequently used for two different colors not only by two different observers, but, also, by the same observer at different times.The problem is difficult for a number of other reasons but, chiefly, because the factors which produce hair color are so little understood. However, in spite of these obstacles hair color was one of the first criteria of race differentiation and has been observed and recorded in most surveys in physical anthropology. This paper presents chronologically a general outline of the classifications of hair color and of the chief investigations and opinions possibly affecting these classifications. The subject of hair-color standards has been included since it has been a factor in influencing the designation of hair colors.

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Physical anthropology of the old Americans. Pigmentation; Grey hair; loss of hair

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Forensic Hair Microscopy

Forensic Hair Microscopy

A study of the age correlations of the cuticular scales, medullas, and shaft diameters of human head hair

Classifications of hair color

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