COMPARISON OF BEARD AND SCALP HAIR 577 %,:, Figure 15. Transmission electron micrograph of Caucasian scalp hair cross-section showing melanin in cuticle and cortex. Magnification 91,600x. The much faster rate of solubilization of Caucasian beard hair, as compared to scalp hair, in urea-bisulfite (Figure 16) is in good agreement with the lower disulfide content of facial hair. c. Swelling Studies in Formic Acid Caldwell and Milligan (19) developed a gravimetric method for measuring the extent of swelling of wool in concentrated formic acid and correlating the swelling data with the

Figuce 14. Transmission electron micrograph of •ucasian board hair cross-so.ion showing mdanin • medulla. Magnification 91•x. Figure 15. Transmission electron micrographs showing melanin in the cuticle, cortex and medulla of Chinese scalp hair. ME: Melanin CO: Cortex.

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