Jan.] THE HOT-HOUSE. 91 
the admission of fresh air, as well as to let out the foul air of the 
house, even when the under lights cannot be raised with safety. 
In frosty weather, the windows must be kept constantly ciose; 
and, if very severe, let the window shutters be shut every night, and 
even occasionally in the day time, when the frost is extremely rigor- 
ous, and no sun; or, in default of shutters, on this occasion, let gar- 
den-mats be nailed up against all the windows, or strong canvass 
hung on rollers, be let down before them, and remove ihe small or 
more tender plants in front, as far from danger as possible. 
Keep the plants perfectly clear from decayed leaves, and as clean 
as possible from any considerable foulness; and every part of the 
house clean and free from litter of fallen leaves, Sec. all which is 
essential at this time for the prosperity of the plants in general. 
When the weather is foggy, or very wet, it will be proper to keep 
the windows and door close. 
Water must be given to such plants as you see require it; but let 
that be given in very moderate quantities, and always, if possible, 
take the opportunity of a mild day, and if sunny, the better: in the 
forenoon, from eleven to twelve or one o'clock, is the proper time 
of the day for watering at this season; and generally prefer soft 
water for this occasion. 
But very little water must be given at this season of the year to 
any of the aloes, sedums, or any other of the succulent plants. 
Let it likewise be observed, that such of the woody exotics, as 
oranges, myrtles, geraniums, 8cc. as you shall see necesary to wa- 
ter, should have but a very moderate quantity given them at any one 
time. 
In such green-houses, where there is the convenience of flues, for 
occasional fire-heat in very rigorous weather, you should, in time of 
continued severe frost, make moderate fires in an evening and 
morning, just sufficient to warm the inclosed air enough to resist 
the frost; also in very foggy or moist weather, may make a very 
moderate fire to expel the damp, which often proves pernicious to 
some of the more delicate exotics of this department. 
THE HOT-HOUSE, 
HOT -HOUSES or STOVES, are buildings erected for pre- 
serving such tender exotic plants, natives of the warmer and hot- 
test regions, as will not live in the respective countries where they 
are introduced, without artificial warmth in winter. 
Though there are great varieties of these stoves, yet they are 
reducible to two; the dry stove and the bark stove. They are 
both, comparatively, of modern invention; the first, as far as I can 
learn, not having been in use more than one hundred and twenty- 
