156 PEACH CULTURE. 



backwards until it reaches a height of 14 feet. The roof 

 is supported by rafters running from the low wall on the 

 * south to the high one on the north ; and these rafters 

 should be spaced to correspond with the width of the 

 glass used in constructing the roof. A foot or fifteen 

 inches apart will do very well. These rafters are grooved 

 on the upper side, to admit the glass in the same manner 

 as the frames for covering approved hot-beds. The glass 

 reaches from one rafter to another, lies in these grooves, 

 and is secured by putty in the usual manner. In putting 

 in the glass, the glazier, commencing at the bottom, or 

 low wall, lays one pane, and then another, allowing the 

 lower edge of the second one to overlap the upper edge 

 of the first about half an inch, and so throughout, so as 

 to make a perfect water shed. 



When cold air is to be introduced from the floor or 

 ends, the roof m.iy be of one entire piece ; but if from 

 the roof, this is provided for in its construction ; and the 

 best and most convenient method is to have the rafters 

 mortised into a beam, at a suitable distance from the 

 J south wall say four feet and glaze in the manner de- 

 scribed above, upward from this. The lower section will 

 consist of squares, fastened with hinges in their upper 

 edges on the beam, and lying flat on the south wall. 

 These can be raised or closed, as occasion may require. 



If the house is to be ventilated at the ends, it can be 

 done by either wooden or glass doors ; but, in any case, 

 care must be taken that they close tight, as otherwise a 

 sudden severe frost may surprise the gardener, and greatly 

 disappoint and mortify the owner. 



The furnace is properly placed, just outside the end 

 wall, and it is not material which wall. Convenience will 

 usually decide this. The flue may be either close to the 

 north wall, or six feet south of it, as one or two rows of 

 trees are to be planted. It may be under the surface or 

 above it an arched trench, or stove-pipe, or a combina- 



