The oil known as Indian Grass Oil, has been referred by Dr Royle to the Andropogon Calamus-aromaticus, a plant which he conceives to be identical with the Καλαμος αζωματιχος of the Greeks. It has been used in medicine as a stimulant embrocation in rheumatism, &c.

The oil, which was green, became yellow when heated. It acquired a steady boiling point at 440°, between which temperature and 442°, a transparent colourless oil distil over.