The recipes for the compositions which, wheu placed on the fire, cause the soot to be removed from the chimney, are trade secrets. By one plan the fire is got into a bright condition, then a very thin layer of small coal is put on. On top of this is laid a whole stick of sulphur; this measures about 7 in. long by liin. diameter, and is perhaps better known as brimstone in the stick form. The stove is then closed up and the damper opened full. This method is of use with closed stoves only; it also answers to extinguish a chimney fire. With open grates some form of blower must be employed to make the draught sufficiently strong, but this is a necessary condition also with the packets of materials before referred to. The efficacy of the sulphur is said to be improved by placing with it one or two raw onions on the fire.