DREER’S VEGETABLES UNDER GLASS. 25 
ually upward until it reaches the air space which is under 
the entire seed bed. Out of the open space beneath the bed, 
at the end opposite the fire, there is a square wooden chim- 
ney made of boards, which carries off the smoke and the 
other products of combustion. 
The arrangement of earth, as shown in the cut, prevents 
the heat in the seed bed from being excessive at the furnace 
end. The terra cotta or brick flue leading from the fire ter- 
minates several feet from the lower end of the wooden chim- 
ney, at a point perhaps fifty feet from the fire. 
The chimney is twelve to sixteen feet high, and the bed 
itself is say twelve feet wide and sixty feet long. For such 
a bed the furnace must be about four feet deep, two feet high 
and eighteen inches wide. An eight inch terra cotta flue 
would answer for such a furnace. 
The seed bed is supported by sleepers thrown across, 
four feet apart, on which boards are laid. The bed is a foot 
deep over the fire, and six or eight inches deep at the chim- 
ney end. 
The small_cut shows the manner in which either glass or 
cloth may be used to cover the bed. 
Many such beds are to be seen on the New Jersey side 
of the Delaware river, not far south of Philadelphia ; but, as 
already stated, their use is confined to certain localities. 
The love of the thing: that is the key to success in any 
line of work. It is nowhere more true than in horticulture. 
