AKD CONSEEVATOUT. 



37 



house of a substantial nature, well adapted both for keeping a 

 stock of bedding plants in winter and a fair supply of plants in 

 flower all the year through. We must have a good wall to 

 begin with, and reckon that as( costing nothing in connection 

 with the undertaking. AVe must next resolve to have a fixed 

 roof, in order to use light rafters and secure ventilation at the 

 back and front. One considerable item in the cost of glass- 

 houses is the framing of sashes and. the making them to slide 

 open for airing. These not only consume a quantity of timber 

 and. increase the weight of the roof, which, in its turn, must be 

 supported by large rafters, but they require the time and skill 

 of a competent joiner to frame them. Now, so long as a roof 

 is fixed firmly and steadily in its position, and without movable 

 lights, large rafters may safely be dispensed, with, and bars 

 alone be used, as shown in the accompanying plans, the bars 

 to vary in depth and thickness according to the width and 



SECTION OF lEAX-TO GEEENHOrSE SECTION OF SASH-EAE. 



weiglat of the glass used. The section (k) shows a bar suffi- 

 ciently stout for glass eight inches wide and sixteen ounces to 



