14 GREENHOUSES 



When sash are glazed at home they should 

 first be primed with a coat of lead paint. On 

 looking them over it will be observed that 

 one of the end bars is not so thick as the 

 other, the upper surface being in line with 

 the bottoms of the grooves or channels made 

 to receive the glass. This is the lower end of 

 the sash and should always be placed toward 

 the south. The glazing also begins at this 

 end. In glazing, the first pane is laid flat, the 

 bottom of the second lapped over the top of 

 the first and so on, small brads or glazing 

 points being placed at the lower end of each 

 pane and along the sides to hold them in 

 place. Since the lap obstructs the light it 

 should be as narrow as possible, an eighth 

 of an inch being as wide as necessary. In 

 order to obviate the necessity of cutting the 

 last glass to keep the laps even, it is well to 

 lay all the panes for one row on loosely, and 

 to space them before fastening any. They 

 should then be puttied the same as ordinary 

 windows, and thoroughly painted. 



A more satisfactory way of setting the 

 glass is to bed them in putty as described in 

 Chapter VII, but this method is rarely used 

 with hotbed sash. Sometimes the glass are 

 butted ; that is, they are laid flat, end to end, 



