1917] McCNAIR—FATS FROM RHUS 331 
solvent, and crystallization of the solid matter. The substances 
thus purified are pale yellow, hard, with a conchoidal and some- 
what lustrous fracture. Their odor recalls that of tallow and 
beeswax. Under the microscope they appear to consist of small 
and large refractive grains. They are insoluble in water, slightly 
soluble in cold 95 per cent alcohol and ether, easily soluble in hot 
95 per cent alcohol (separate on cooling to granular crystalline 
Jan. Feb. Mar. Apr. May June July Aug. Sept. Oct. Nov. Dec. Jan. 
iG. t 
mass), warm ether, benzol, petroleum ether, and carbon bisul- 
phide. They form grease spots when melted on filter paper. 
That glycerol is probably a constituent is evident from an irritating 
odor of acrolein evolved when the substances are mixed with 
powdered potassium bisulphate and heated in a dry test tube. 
From a consideration of their physical and chemical properties 
so far determined, the fats from R. laurina and R. diversiloba seem 
to be similar to Japan wax. This means that similar fats have 
been found in a non-poisonous and a poisonous species of Rhus. 
