WIDE G^BZlTnOUC- AND KOSE HOUSE. 93 



The cheapest kind of construction is the lean-to just 

 described, that is, where there is anything to lean it 

 against, such as the gable of house or barn. But if the 

 greenhouse has to be constructed entirely new, I think 

 the span-roof is best see figure 23. The roof can be 

 formed by the ordinary three by six feet sashes, placed as 

 shown on figure 22, " Section of a Cheap Greenhouse," or 

 what is better and which is the plan now in general use, 

 is to make the roof fixed, using bars one by two inches, 

 in which the glass is laid. For ordinary greenhouse work 

 the glass used is eight by ten inches, put in the ten-inch 

 way, but for Rose forcing houses, or for other plants grown 

 for flowers in winter, a larger size glass should be used 

 say, twelve by sixteen inches, put in the twelve-inch way. 



CHAPTER XVII. 



WIDE GREENHOUSES FOR BEDDING PLANTS AND 

 ROSE GROWING. 



The plans and descriptions of greenhouses given in the 

 preceding pages, have been mainly for nan-ow green- 

 houses eleven feet wide, but further experience has led 

 me to believe that the wide greenhouse, twenty feet wide, 

 is for general purposes better than the narrow. The most 

 approved plan of greenhouse for growing bedding plants 

 for commercial purposes is that shown by figure 23, 

 which usually average twenty feet in width, and are of a 

 uniform length of 100 feet. Of course, the length is a 

 matter of convenience, but the width we find is an im- 

 portant point to consider ; for if over twenty feet the 

 benches are too wide to reach easily, and if under twenty 

 feet, room is lost by the necessity of having two walks in 

 a narrow space. Figure 24 shows the inside arrangement 

 of this style of greenhouse as we have it in use. One 



