344 



FORCING GARDEN. 



A vinery, with flues and two furnaces, is generally 

 fifty feet long, twelve or fourteen wide within, the height 

 of the back wall being ten or twelve feet. Where there 

 is only one surface, or where a hot-water apparatus is 

 employed, the length of the house should -not exceed 

 thirty-five ar forty feet. Small divisions are to be pre- 

 ferred; for w^here there is a considerable extent of glass, 

 the cultivator, by applying his fires to the difi^erent di- 

 visions in succession, can prolong the crop from May 

 to December. [£h.e parapet wall in front is commonly 

 arched, or built on lintels, supported by stone pillars ; 

 so that the vines, which are planted inside j;he house, 

 close by the parapet, may send. abroad their roots in 

 search of nutriment- Sometimes the vines are planted 

 without, and introduced into the house by slanting aper- 

 tures in the front wall; but the former method, w^here 

 possible, is the more eligible. , The trellis used for train- 

 ing is generally formed of wires drawn across the rafters, 

 at the distance of a foot from each other. Of late the 

 trellis has frequently been divided into portions of a 

 moderate, breadtb, placed vei'tically under the- rafter. 

 'This foTm is called the hanging trellis, ^nd is described 

 at length in the Lond. Hortic. Trans'.^ vol, vi. A sec- 

 tion of one variety has this appearajice. 



Fi2. 37. 



