CULTURE OF THE KOSE. 137 



are about 3 feet from the walk, giving room enough from 

 the glass to grow plants from 2 to 3 feet in height. We 

 have used these benches exclusively for growing Roses in 

 pots, but they may be used, of course, for any other plants 

 requiring the same temperature as the Roses. At the end 

 of the house to the north is placed the furnace pit and 

 sheds, so that the other end is due South.' This we think 

 the best aspect for an equal span-roofed green-house. When 

 it is a " half-span," then the long side should be due East 

 the ends being North and South. The cost of each style 

 is nearly similar and will be found estimated for the "half- 

 span " style at page 131. Ventilation is given by " lift- 

 ing sashes " along the roof on the East side of both kinds 

 of green-houses by means of a patent ventilator. In this 

 ventilator a jointed iron arm is fastened to each sash, and 

 the other end of the arm is attached to an iron shaft that 

 runs horizontally the whole length of the house close to 

 the roof. By means of a crank placed in a convenient 

 position and proper gearing the shaft is made to revolve, 

 and this acting upon the arms lifts the sashes simultaneous- 

 ly. But very little exertion is required to move it, and 

 the ventilators can with the greatest ease be opened a 

 mere crack or to their fullest extent. Either of these 

 styles of span-roofed green-houses, would be more econom- 

 ical to have the width 22 or 24 feet rather than 20, so 

 that the centre bed for Roses might be wider. 



There are comparatively few varieties of Roses suitable 

 for producing flowers in sufficient abundance in winter 

 to make it profitable, and these few are such as in the 

 summer months are by no means our finest ; but they 

 are selected for winter, not for their developed flowers, but 

 for their buds. Thus the Safrano, one of the most valued 

 for its saffron yellow buds, is but semi-double. Those 

 most valued by the New York florists are: 



Lamarque, White, with a tinge of straw color in the 

 center ; a vigorous grower, usually trained up the rafters. 



