46 The Principles of Vegetable -Gardening 



is done, allowing the land to be used for other pur- 

 poses. See Figs. 7 and 8. In this book, it is not 

 intended to discuss permanent glass buildings, as forc- 

 ing-houses. The growing of winter vegetables in the 

 North is a special business, and demands a volume 

 to itself.* 



Vegetable -gardening glass is usually computed in 

 sashes. A normal sash is 3 x 6 feet in surface area. 

 Sashes are combined into frames. A frame is a box 

 covered by four sash, that is, an area 6x12 feet. 

 For general and mixed vegetable -gardening, about 

 twenty -five sash are sufficient for an acre of garden, 

 considering that the plants are to be transplanted to 

 the field, not matured under the sash. If one is grow- 

 ing particular crops, as tomatoes, fifteen sash may be 

 sufficient. For the best kind of home gardening, when 

 it is desired to mature spring lettuce and radishes 

 under glass as well as to transplant stuff into the 

 open, from thirty -five to fifty sash may be needed 

 to the acre. 



In growing plants for transplanting, a sash may be 

 estimated to accommodate four hundred to five hun- 

 dred cabbage and cauliflower plants, three hundred to 

 four hundred tomatoes and eggplants, six hundred to 

 eight hundred lettuces. When the plants are trans- 

 planted in the frames, only one -third to two -thirds 

 these numbers can be accommodated. If the plants are 

 started very late and are not transplanted, as many as 



* There are three American books devoted exclusively to vegetable-growing 

 under glass : Winkler's "Vegetable Forcing," 1896 ; Dreer's "Vegetables Under 

 Glass," 1896 ; Bailey's "Forcing-Book," 1897, 



