GENERAL CULTURE OF STOVE PLANTS. 
65 
Horticultural Society of London several modes of heating by steam^ wliicli no 
doubt would be found to answer 
For Bulbs, Cacti, &c. These two figures represent an elevation and plan, 
exhibiting the mode in which bottom heat is supplied to stoves for bulbs, cacti, &c., 
by the agency of steam. A paved water-tight bottom being built on stones, earth, 
or any suitable support, with a declivity towards any convenient part, of about one 
inch in ten feet to allow of drainage ; channels are formed about three inches deep, 
and of the same width, crossing each other, shown in the lower figure, which also 
represents two small steam-pipes, each three-quarters of an inch diameter, closed at 
the further end, and having perforations about one tenth of an inch diameter oppo- 
site each other, and in the middle of the channels. 
The result is, that when steam is admitted into the pipes, it is discharged in 
opposite directions, through the orifices, filling the whole space of the channels 
with hot vapour ; the channels being covered with brick or stone, jointed without 
mortar, the vapour which percolates between the joints is arrested by a bed of 
stones or broken bricks, about fourteen inches deep above the paved bittom ; on 
this again is placed a bed of sand about one foot deep, in which the pots are 
plunged to any suitable depth. 
The vapour is so completely arrested by the strata of stones, <&c., and sand, 
beneath the pots, as to communicate a heat congenial with the health of the plants, 
Avithout the least excess of moisture. 
For Aquatic Plants. This figure represents a mode of warming a cistern or 
reservoir of water for the preservation of Aquatic Plants, as erected at Mr. Miller's 
Nursery, at Clifton, in front of one of the greenhouses, and having a glass roof. 
Steam is admitted by a pipe three quarters of an inch diameter, having perforations 
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