The amino-acid compositions of oxidized normal and copper-deficient wool from one sheep and of two components separated from them at pH 6 have been measured by ion exchange chromatography. The differences between the "soluble" and "insoluble" components are those expected from previous work. The "insoluble" components from normal and copper-deficient wool appear to be identical, although there is a small dif ference in the "soluble" components. Attempts at fractionating the "soluble" components , by chroniatogrtphy, paper electrophoresis, and dialysis gave indications of heterogeneity but were not very successful.
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