THE FLORAL WOELD AND GARDEN GUIDE. 1? 



well, both as rea;arcls cheapness and utility. They can, therefore^ 

 be the most strongly recomtueuded. For the purpose of affording 

 additional strength to the roof when sash-bars are employed, a 

 rafter four inclies deep hy three inches wide must be fixed at every 

 six feet, and they and the bars should be connected together with 

 an iron tie-bar running along t le middle of the roof. This is simply 

 an iron bar an inch and a-half in width and a quarter of an inch in 

 thickness, and has screw holes at the same distance apart as the 

 rafters and bars. The latter, it may be useful to add, should be two 

 inches in depth and one in width, and be secured at the top to a 

 plate of wood fixed to the wall. In cases where the border is made 





Tig. 3. — Span-roof Vinery, with inside Borders. 



partly within, and partly without, as represented in Fig. 2, the front 

 wall should be built upon arches to allow the roots to extend freely 

 in both directions. In ail other cases it should, of course, be quite 

 solid. 



PREPARATION OE THE BORDER. 



As vines frequently become unhealthy, and the grapes " shank," 

 or refuse to colour, when the roots run down into a cold and uncon- 

 genial subsoil, the proper steps must be taken to prevent their ex- 

 tending below the border. The latter may be partly below and 

 partly above the surface, as in the diagrams, or it may be altogether 

 below the surface. This point must be determined at the com- 

 mencement, so as to have the foundations a!; the proper depth, 

 without at the same time wasting money in having them deeper 

 than is really necessary. It will serve as a guide if it is at once 

 said that the depth of the soil should be three feet, the drainage 



Jaiiu'jr}'. 



