390 LANDSCAPE GARDENING. 



eighth of an inch, while it would require to be one-fourth 

 of an inch, were the panes of the usual size. On the front 

 and sides, the sashes may be handsome, and filled in with 

 the best glass; even plate glass has been used in many 

 cases to our knowledge here. 



In the second place, some thorough provision must 

 be made for warming the conservatory ; and it is by far the 

 best mode to have the apparatus for this purpose entirely 

 independent of the dwelling house ; that is (though the 

 furnace may be in the basement), the flues and fire should 

 be intended to heat the conservatory alone; for although 

 a conservatory may, if small, be heated by the same fire 

 which heats the kitchen or one of the living rooms, it is a 

 much less efficient mode of attaining this object, and 

 renders the conservatory more or less liable at all times 

 to be too hot or too cold. 



The common square flue, the sides built of bricks, and 

 the top and bottom of tiles manufactured for that purpose, 

 is one of the oldest, most simple, and least expensive 

 methods of heating in use. Latterly, its place has been 

 supplied by hot water circulated in large tubes of three 

 or four inches in diameter from an open boiler, and by 

 Perkins's mode as it is called, which employs small pipes 

 of an inch in diameter, hermetically sealed. Economy 

 of fuel and in the time requisite in attendance, are the 

 chief merits of the hot water systems, which, however, 

 have the great additional advantage of affording a more 

 moist and genial temperature. 



In a green-house, the flues, or hot water pipes, may be 

 concealed under the stage. In conservatories they should 

 by all means be placed out of sight also. To effect this, 

 they are generally conducted into a narrow, hollow 



