As used in policies of insurance, this term does not mean any fluid which will burn, but it means a recog-nized article of commerce, called by that name, and which is a different article from naphtha or kerosene. Putnam v. Insurance Co. (C. C.) 4 Fed. 764; wheeler v. Insurance C0., 6 Mo. App. 235; Mark v. Insurance Co., 24 Hun (N. Y.) 569