In the north of Luzon, Pinus insularis, Endl. occurs in the Province of Benguet. It closely resembles the American Pinus ponderosa, Dougl. and the Indian P. Khasya, Royle. According to the observations of Richmond2) it yields an oleoresin that resembles crystallized honey in appearance and has a pleasant odor. Steam distillation yielded 23,4 p. c. of a water white turpentine oil. The constants of the oil are: d-30/30oo,8593; aD30o + 13 to +27°; nD30o 1,4656; 96 p. c. of the oil distil over between 154 and 165,5°. The resin after filtration (leaving but 1 p. c. of impurities) was light in color and otherwise good. The oleoresin had been produced by the box system. It is supposed that the cup and gutter system would yield better results3).
The oil contains d-a-pinene (nitrosochloride, nitrolbenzyl-amine) and B-pinene (m. p. of nopinic acid, 121°)4).