JAN.] THE GREEN-HOUSE. 81 



Some green-houses for large collections of plants, have two wings 

 of smaller dimensions, added to the main building, one at each e r id, 

 in a right line, separated sometimes from it by glass partitions, and 

 sliding sashes for communication, the front almost wholly of glass, 

 and part glass roofs, as above observed ; thus by these addition?! 

 wings, the green-house will consist of three divisions,whereby the dif- 

 ferent qualities and temperatures of the various plants can be more 

 eligibly suited. The middle or main division may be for all the 

 principal and more hardy, woody or shrubby kinds, which require 

 protection from frost only ; one of the wings may be appropriated 

 for the succulent tribe, and the other for the more tender kinds that 

 require occasional heat in winter, yet can live without the constant 

 heat of a stove or hot-house. 



Many green-houses, as they are commonly built, serve more for 

 ornament than use ; their situation to receive the south sun being 

 the only essential, that seems to be regarded, towards preserving 

 the health of the plants which they are intended to protect. It is 

 rare to find one that will keep plants in good health during the win- 

 ter, either by reason of their situation in moist places, their want of 

 a sufficiency of glasses to attract heat and admit a due quantity of 

 light, or of the glasses not being constructed so as to slide up and 

 down occasionally, as they ought. ...as well to suffer the foul air to 

 be discharged as to admit fresh. Sometimes where a Green-house 

 has been well considered in these points, all is confounded by the 

 introduction of a mettle stove and pipes, which never can be man- 

 aged so as to give, when necessary, that gradual and well regulated 

 heat, which will protect the plants without injuring them ; and, be- 

 sides, both the stove and pints unavoidably emit in the house a 

 quantity of smoak, which seldom fails to annoy the plants. It does 

 not unfrequently happen, when such a house is entrusted to the care 

 of an ignorant or negligent person, that the whole collection is de- 

 stroyed in one night, by excessive heat, or at least rendered of very 

 little value ; this is an evil which ought to be carefully guarded 

 against. 



For the particular method of erecting the furnace and flues, see 

 the article HOT-HOUSE, for this month ; with which it agrees in 

 every respect, only that one range round the house, and two along 

 the back wall, will be sufficient; and that the flues may or may 

 not be erected close to the walls, at pleasure. 



On whatever plan the Green-house is constructed, let the whole 

 inside, both ceiling, walls and flues, be neatly finished off with good 

 plaister and white-wash, and all the wood-work made with the most 

 critical exactness, of good seasoned timber, particularly the doors, 

 sashes and sash-frames. ...the whole to be painted white. ...and let the 

 bottom or floor be paved with large square paving tiles, or some 

 similar materials. 



The floor of the Green-house should be raised at least twelve 

 inches above the level of the ground, and higher in proportion as 

 the situation is moist or springy.... for damps sometimes arise dur- 

 ing the winter months, which proves very rjernicious to plants. 



