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THE papaya (Carica Papaya L.) is an important fruit in many tropical countries. In the Hawaiian Islands, the papaya, pineapple and banana are the fresh fruits locally grown which are available the year round. Papaya is easily grown, is a cheap fruit and is used in large quantities by all economic classes. Since the experiments here reported were begun, the vitamins of papaya have been reported on elsewhere. Acuiia [1923] from the Philippines reported on the vitamin B content, but his work is difficult to evaluate as the rats