Studies were made of the oil obtained from the adipose tissues of Chúi-koe, a kind of frogs (Rana tigerina Daudin and R. rugulosa Wiegmann or R. tigerina Anderson) caught in the suburbs of Taipei, Formosa, between October and November in 1942. These fatty substances were obtained from male and female frogs separately and results of observations were as follows:
1) Oil: (a) That from females contained a remarkable amount of carotinoids but no great difference existed in general properties. (b) Solid fatty acids, from both sexes, were palmitic and stearic acids while liquid acid included unsaturated acid of C₁₈ series and a higher unsaturated acid. (c) Unsaponifiable substances, from that of both sexes, were mostly steroid, especially, cholesterol, with the addition of a small amount of carotinoid.
2) Fat: This was dipalmitostearin from both sexes.