The study of the conditions and factors affecting hair growth in the guinea-Pig (With Plates II and III and seven text-figures.)

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Abstract
Summary 1. A method for the weekly determination of the amount of hair produced on defined areas of skin is described. 2. The normal hair growth in adult male and female guinea-pigs has been determined. It is shown that the amount of hair produced on a defined area of skin in equal intervals of time is not constant. The fluctuations are mainly due to variations in the number of follicles which are active. 3. There seem to be two periods during the year when an increased production occurs in most animals, in late spring and autumn. The times of increased hair growth correspond approximately to the occurrence of the moult. 4. Measurements have been made of the length of the fibres at the end of a week's growth. It is found that fibres of all lengths are present and that the maximum length at the end of any week in any stage of the cycle is 5 mm.

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