Greenhouse Construction. 9 



inch deep and of equal width made for the reception 

 of the glass, letting the same be at such a distance 

 from the lower edge, that when the bars are in place, 

 the under surface of both the bars and the ridge will 



Fig. 5. 



be fair. See Fig. 5. This permits the ridge to rise five 

 inches above the bars, which will be found of great ad- 

 vantage when ventilators open at the top. 



"\A'ith the walls complete, it saves labor to construct 

 the benches before putting on the roof, as they can 

 usually be utilized as staging for the superstructure. 

 In the construction of benches there are many kinds of 

 material used. Wood or gas pipe for uprights, slate 

 or tile for the floor. The method adopted will de- 

 pend mainly upon the amount of money one has to 

 put into their construction. If wood is used for up- 

 rights, it is not advisable to use anything but the best 

 cedar, but if this is not at hand, locust, chestnut, 

 white oak or cypress according to their availability. 



Fig. 6 shows the usual mode of bench construction in 

 three fourths span houses. This method of building has 

 long been deemed necessary in northern latitudes. 



