Jan.] the hot-house. 99 
and promote the growth and health of plants so well as that gradual 
glow of moderate warmth issuing from flues of several returns, 
carried under the walks or other convenient places, as well as 
round the front and end walls, either in double or single ranges, 
and especially under the back walk, over which broad planks may 
be laid, resting on loose bricks, for the convenience of walking during 
the winter season; from these the heat will be equally diftused 
through the whole house, and to produce which, half the fuel will 
not be necessary that must be consumed in keeping the house warm 
by a single range round the front and ends only. 
In the erection of stoves it will not be necessary to have the ends 
glazed more than half the width of the house, or at most, to within 
eighteen inches of the doors, leaving that much for piers between 
the doors and the upright end sashes; the remainder may be carried 
up with brick as high as the roof lights. 
In stoves that are so long as to require two fires, each with its 
respective ranges of flues, it will be proper to make a glass partition 
in the middle, and to have two tan-pits, that there may be two dif- 
ferent degrees of heat for plants from different countries; and were 
a range of stoves built all in one, and divided by glass partitions 
at least half the width of the house towards the front, it would be of 
great advantage to the collection, because they may have ditterent 
degrees of heat according to their diSerent natures, and likewise 
the air in each division may be shifted, by sliding the glasses of the 
partitions, or by opening the glass door which should be made be- 
tween each division, for the more easy passage from one to the 
other. 
In the warmest of these stoves or divisions, should be placed the 
most tender exotic trees and plants. These being natives of very 
warm countries, should be plunged in the bark-bed, and over the 
flues may be shelves on which to place the various species of Cac- 
tuses, Euphorbiums, Mesembryanthmeums, and other very tender 
succulent plants which require to be kept dry in winter. 
As in this stove are placed the plants of the hottest parts of the 
East and West Indies, the heat should be kept up equal to that 
marked Ananas upon the botanical thermometers, and should never 
be suffered to be more than eight or ten degrees cooler at most, nor 
should the spirit be raised above ten degrees higher in the thermo- 
meter during the winter season, both which extremes will be equally 
injurious to the plants. 
The roofs of some stoves are so made, that the glasses do not 
slide either up or down, which is an evil of great magnitude; for 
where the sun is so powerful in the months of April and May, as it 
is in every part of the United States, the superabundance of heat 
collected in the house on very hot days, cannot be discharged by the 
doors and sliding upright sashes in front, which forces the plants 
into an extreme state of vegetation, and renders them unfit to bear 
the open air towards the latter end of May, when otherwise the 
greater number of them might be brought out with safety, without 
receiving such a check by the transition, as many cannot recover 
during the summer, and causing many more to appear much less 
