Sindora Wallichii, Benth. (family Leguminosae), the plant from which the supa balsam3) is derived, is found all over the Philippine Islands. A freshly wounded tree yields about 10 1. . of balsam. This is a mobile, homogeneous liquid, light yellow ' in color, with a slight fluorescence and a faint but characteristic odor: d30/30o0,9202; aD30o - 31,3°; when cooled below 20° it separates white, flocculent crystals that constitute about 5 p.c. of the oil. They melt at 63 to 64° and are a hydrocarbon. Supa balsam dissolves in all of the ordinary solvents but alcohol. It absorbs atmospheric oxygen and finally solidifies. When distilled with steam a colorless oil is obtained: d30/30o0,9053; aD30o - 21°; the bulk of the oil distills between 143 and 149° under 40 mm. pressure; when repeatedly distilled under 760 mm. pressure the oil distils between 255 and 267° without appreciable residue. If, however, the balsam is first distilled without water vapor in vacuum, 73 p. c. pass over consisting of little water and mostly of an oil which under 40 mm. pressure passes over below 170° without, however, revealing a definite boiling point. This oil distills within arrange of seven degrees and presumably consists of a mixture of sesquiterpenes. Of these cadinene was identified by means of its hydrochloride (m. p. 117 to 118°) by passing hydrogen chloride into the glacial acetic acid solution of the distillate. The regenerated cadinene boiled between 164 and 165° (38 mm.); aD30o - 78° ( - 39° in a 50 mm. tube). The inaction of both sodium and phosphorus pentoxide in benzene on the oil revealed the absence of alcoholic substances.
1) For the properties of the balsam see G. Weigel (Pharm. Zentralh. 47 , 773), D. Hooper (loc. cit.) and Schimmel & Co. (Report of Schimmel & Co. April 1907, 109).
2) Pharm. Zentralh. 44 (1903), 147.
3) A. M. Clover, Philippine Journ. of Sc. 1 (1906), 191. Clover refers to the balsam as wood oil, a designation likewise applied to gurjun balsam and to other balsams derived from the Dipterocarpaceae.