THE GEEENHOUSK 119 



plants as may be brought forwarder by their removal from 

 the open ground, Eoses, for instance, are forwarded by re- 

 moval to the greenhouse, and if they are intended for forcing 

 in a warmer temperature, they should always be commenced 

 by a change from no protection at all to that afforded by the 

 greenhouse ; and when inured to this, they may be placed in 

 the forcing-house, kept at first do^vn to a low temperature 

 and gradually increased ; but roses bloom well in a green- 

 house without any other aid than the mere absence of fi'ost 

 and chilling winds. 



In large establishments there are several greenliouses, 

 honoured, it is true, by the names of the plants to which 

 they are devoted, but all requiring sometliing like similar 

 treatment, — that is to say, to be kept dry, cool, and free from 

 frost. The camellia-house, the heath-house, the Botany Bay- 

 house, and the azalea-house, are only so many greenhouses 

 devoted to camellias, heaths. Botany Bay plants, and azaleas ; 

 but as a proof that these will do well with pretty nearly the 

 same treatment, we have seen a larger greenhouse devoted to 

 specimen plants, and containing noble plants of all we have 

 mentioned, luxuriating in the same atmosphere, and subjected 

 to the same good or ill usage. The great object is to keep out 

 frost without getting up the temperature too high ; the one is 

 necessary, but all that the house is heated above forty-five by 

 day or forty by night during winter, draws up the plants and 

 renders them weakly. The geranium-house, where these 

 plants are grown upon the system of propping up every shoot, 

 will not do with the common treatment of a greenhouse, for 

 it has to perform the part of a forcing-house as well ; the 

 house is frequently syringed all over, and shut up ^ith the 

 plants at a temperature of 55 to 60 degrees ; then, being 

 in this excited state subject to the green-fly, the plants re- 

 quire to be frequently fumigated, — an operation which, since 

 the invention of Brown's patent fumigator, is not half the 

 trouble, nor a quarter of the expense incurred by the use of 

 the fumigating bellows, or any of the other means usually 

 resorted to. Thus, therefore, although the geranium does 

 admirably in a common greenhouse, and without any other 

 treatment than will do for camelHas, and heaths, and Botany 

 Bay plants genei-ally, it is the fashion to force them for May 

 and June exliibitions, to draw them up weakly, and tie them 

 up to scores of sticks to hold them in their places ; but if we 



