وللأسنان أَيْضا تَأْثِير فِي أَمر الشّعْر فَإِن الشبَّان كالجنوبيين وَالصبيان كالشماليين والكهول كالمتوسطين وَكَثْرَة الشّعْر فِي الصَّبِي تدلّ على اسْتِحَالَة مزاجه إِلَى السوداوية إِذا كبر وَفِي الشَّيْخ على أَنه سوداوي فِي الْحَال
Relation of character of the hair to the age. In puberty the hair is as in northern countries in youth, as in southerly countries; after the age of fifty it is between the two. Abundance of the hair at puberty reveals the future temperament. As the person grows, it precedes the formation of atrabilious humour, and in the elderly person it shows that atrabilious humour is actually present