THE GREEN-HOUSE AND CONSERVATORY. 31 



To construct the roof, form a " plate " along the posts, 

 front and back ; to this nail the rafters, running from post 

 to post. Into these rafters fit lighter pieces of wood, run- 

 ning at right angles with the rafters the whole length of the 

 house, letting the top be flush with the top of the rafter, 

 thus, R R, being the rafters, C C being the cross-pieces. 



Then, parallel with the rafters, along the whole length 

 of the house, nail other lighter strips to the cross-pieces, 

 C C, securing them at eaves and top to the plate. 



These strips should be grooved like a common sash bar, 

 and laid upon the roof just far enough apart to receive the 

 glass. Glaze with common clear glass. Paint all with 

 fire-proof paint, and you have a green-house sufficient for 

 all purposes, at a cost of about six dollars per foot. This 

 cost may be indefinitely increased by using finer materials ; 

 our estimate is for rough boards and common glass. Heat 

 by a common stove, as above described, or by a brick flue. 

 For this latter, however, a small cellar near one end, cov- 



