1. Some chemical natures of lipase-activator were described.
2. The lipase-activator is an unsaponifiable substance in the castor oil seeds.
3. The hydrolytic reaction by ricinus-lipase is accelerated by reduced glutathione, cysteine and ascorbic acid, but the synthetic reaction is retarded by them.
4. The inactivated ricinus-lipase by oxidation is not reactivat-ed by cysteine, reduced glutathione and ascorbic acid in both hydrolytic and synthetic reaction.
5. The oxidised lipase-activator is reduced partially by re-duced glutathione.
6. The reduced lipase-activator has a nature capable of form-ing a water soluble molecular compound, though the intermediary and oxidised have no such nature.
7. The fat and esterformation of various alcohols and fatty acids by ricinus-lipase was studied.
The author is greatly indebted to Prof. Dr. Kodama for his kind criticisms and suggestions throughout this research.
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