504 



PRACTICE OF GARDENING. 



Part III. 



joins, and the smoke of the two fires moves in the same tunnel (from d to e), and passes 

 out by the same chimney. When this second furnace is not in use, its connection with 

 the flue of the first is cut off' by a damper at the point of junction (d). A very small fire 

 made in this furnace, in severe weather, not only adds to the heat of the house by its own 

 power, but by increasing the draught, or rate of burning, of the fire in the other furnace. 

 In addition to the fire heat, a steam-apparatus has been lately erected, and the tubes 

 conducted round the houses on the tops of the flues (Jig. 436. d, e) ; this is found to give 

 a great command of heat ; and also to admit of filling the house with vapor at pleasure. 

 The height of the house from the ground to the top of the back wall, is only nine feet 

 (Jig. 437.) ; the rafters of the roof are placed about four feet apart, centre from centre ; 



or about twenty-four sashes are given to every hundred feet ; the front sashes (a) are 

 only eighteen inches high, and slide past each other ; the middle end sash (b) also slides ; 

 the sill of the door (c) and the back path, or border, are on a level with the outer sur- 

 face of the ground, to admit the easy wheeling in of tan, &c. ; the front border (d) is 

 raised considerably above it, on account of the wet bottom ; the back sheds are low 

 and neat ; and the furnaces sunk three feet below the surface (Jig. 436. h, h) to give them 

 a better draught ; and this also serves to drain the back border. The houses are placed 

 in pairs, the furnaces for general use at the extreme ends of the range, and the auxiliary 

 ones in the middle, where the steam-boiler is also placed, but worked by a fire apart ; 

 on the whole, no plan of pine-stove that has yet appeared is more simple, neat, economical, 

 and complete than this ; the only objection we have to them, is, that owing to the great 

 thickness of wood employed in the bars of the sashes, they are rather dark and gloomy 

 within ; but this might easily be remedied by the substitution of light iron rafters, with 

 wooden-framed sashes sliding in them, but the bars of the sashes formed of iron. It is 

 true, gloomy as these houses are, the pines thrive in them as well as can be wished ; but 

 probably by having more light, they might thrive so as to surpass all expectation. 



2653. The pinery of Knight may be described as a pit forty-five feet long, nine feet nine 

 inches wide, the front parapet eighteen inches, and the back wall nine feet high. The 

 roof is constructed of iron sash-bar, fixed, and the bars curved, so that the versed sine of 

 the segment is about twelve inches. Air is given by horizontal openings immediately 

 under the copings of both walls. More light is admitted into such a pit in March, than 

 into a common flat-roofed pit with wooden sashes in May or June. 



438 



2654. As an example of a pinery and grapery conibined, we refer to a curvilinear 

 structure (Jig. 438. ), erected from our designs, at Langport in Somersetshire. This house 



439 



