The Plough

It is more difficult to produce fire by the plough method than with the

bow, but it can be done. The appliances are simple enough. All you need

is a fireboard in which a groove or gutter has been cut, and a

rubbing-stick to push up and down the gutter (Fig. 80).

Other woods than spruce are used with success for fire-drills and

fireboards, but all must be dry. These are soft maple, cedar, balsam,

tamarack, cottonwood root, and _white_, not pitch, pine.