Abstract
(1) The cystin content varies with the different parts of hair and that of the terminal part is always less than that of the other part.
(2) The cystin content of young men's hair, that showed powerful growth, is less than that of old men.
(3) The ratio of cystin to the total nitrogen content of hair is almost constant in differentt ages while the cystin content varies with the ages of people.
(4) The melanin content of black hair is far greater than that of white, and the cystin content of the former is rich, while the nitrogen content is poor.
(5) The relative quantity of cystein in relation to cystin is higher in the case of young men than in that of old men and it seems that someconnection with Hopkin's glutathion may be found in young men's hair but that inold men it may be scant.
