used in policies of insurance, this term does not mean any fluid that will burn, however it implies an accepted article of trade, known as by that title, and which is yet another article from naphtha or kerosene. Putnam v. Insurance Co. (C. C.) 4 Fed. 764; Wheeler v. Insurance Co., 6 Mo. App. 235; Mark v. Insurance Co., 24 Hun (N. Y.) 569.