Coldframes for Wintering Plants 



191 



long-continued use is required. In the former case, cheap "box boards" 

 may be used for the sides and ends, with spruce two by two-and-a-half-mch 

 strips for the cross-pieces to support the abutting edges of the sash. For 

 substantial structures it is well to build the front, back, and ends of brick, 

 twelve inches in thickness, with a four-inch air space in the center, with suf- 

 ficient cross-tie bricks to make the wall strong and secure. These walls 

 should be covered with planks securely fastened by bolts built into the 

 wall. To these planks the cross-pieces or rafters are fastened. Two by 



Cheap but effective pits for wintering tender shrubs. They are protected by a windbreak of willows. The straw and 

 matting are used in very cold weather 



three locust pieces are best for these. The back should be twelve inches 

 higher than the front for the ordinary six-foot width, to give good rain- 

 drainage and an advantageous exposure to the sun. The planks on front 

 and back w^alls should have the same inclination, so that the sash may be 

 easily slid upon them. 



The ordinary commercial sash is three feet wide and six long. The 

 glass may be six by eight, where the sash is liable to rough usage, or ten by 

 fourteen where it is carefully handled and well protected. There will be 



