Burning

(bern'-ing). Consuming with heat or fire. B. of the Feet, a neurotic affection of the soles of the feet, common in India. B. Oil, kerosene. The different burning oils are graded according to the two standards of color and fire-test. The colors range from pale-yellow (standard white) to straw (prime white) and colorle (water white). The fire-tests to which the commercial oils are mostly brought are no° F., 1200 F., and 1500 F.; that of no° going mainly to the continent of Europe and to China and Japan, and that of 1200 to England. An oil of 1500 F. fire-test, and water white in color, is known in the trade as " headlight oil.'''' An oil of 3000 F., fire-test, and specific gravity.829 is known as " mitieral sperm" or "mineral colza oil.'" " Pyro naphtha" is a product of Ru ian petroleum, somewhat similar to mineral sperm oil. It has a specific gravity of.865, and a fire-test of 2650 F. B. Point, in testing petroleum oils, the temperature at which a spark or lighted jet will ignite the liquid itself, which then continues to burn. This point is usually 6° to 200 C. higher than the flash point, but there is no fixed relation between the two.