n6 
JOHNSON & STOKES 
boards the bed is made. At one end is a furnace, with flues 
running out into the air space beneath the bed, but not 
reaching the chimney or smoke-pipe at the opposite end of 
the bed. At the hottest end of the bed the soil is over 
6 inches deep. At the 
cool end a depth of 6 
inches is quite sufficient. 
The whole bed is covered 
either with canvas, muslin 
or with glass sashes, there 
being a ridge pole above 
the bed, running length- 
wise with it, thus giving 
a double pitch to muslin 
or to glass. 
After the soil has been 
heated somewhat, the tu- 
bers are laid on the bed, 
about an inch apart, and 
covered with about 3 
inches of good soil, and 
the soil, in turn, covered 
with leaves or hay, to in- 
crease the warmth of the 
bed. In a week, more or 
less, the sprouts will show 
above the surface of the 
soil, when the leaves or 
hay must be removed. 
The object in not con- 
necting the flues from the 
furnace with the chimney is to economize heat. The air 
chamber under the entire bed becomes evenly heated, and the 
smoke escapes finally by the chimney. This chimney may 
Plant of New Hardy Bush or Vineless 
Sweet Potato. 
