From the Soudan the Imperial Institute in London received an oil said to be derived from Cymbopogon Iwarancusa1). A more careful investigation revealed the source to be Cymbo-pogon sennaarensis, Chiov.2). The herb, with a pennyroyal-like odor, yielded upon distillation 1,005 p.c. of an oil of the following properties: d15o 0,9383; aD20o + 34° 14'; total alcohols 17,3 p.c; 26 to 27 p.c. of the constituents reacted with sodium bisulphite. The principal constituent of the oil is a ketone which resembles pulegone as to odor and other properties. It also contains a strongly dextrogyrate terpene and other high boiling constituents.