Takes the place of 12 teamsters and 12 horses.

Minnesota.] In Northern Michigan a "snow locomotive," Fig.

31, is coming into use, which has tremendous tractive power, hauling one hundred to one hundred fifty tons of lumber over snow or ice.

It moves on runners, but there is between them a large cylinder armed with teeth.

This cylinder can be raised or lowered by the operator as it moves over the surface of the ground.