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Varieties or similar products are gasoline, naphtha, rhigolene, ligroin, etc.

Rhigolene, rig′ō-lēn, n. a volatile product of petroleum distillation.

Then, as the temperature rises to 18� C., rhigolene is given off: that is collected and condensed in another vessel.

The boiling-point of a liquid is, of course, the temperature at which it turns freely into vapour, and just as petroleum when heated gives off first cymogene, next rhigolene, then petrol, benzine, kerosene and so on, in the order named, so liquid air, when it is evaporated, gives off its different constituents in order.

Dr. J. Knox Hodge recommends the following as an application which will relieve facial or any other neuralgia almost instantaneously: Albumen of egg, one drachm; rhigolene, four ounces; oil of peppermint, two ounces; colodion and chloroform, each one ounce.