50 



THE AMATEUE's GEEENHOUSE 



by four inches, and the gutter must be lined with zmc or thin 

 lead, to prevent the water injuring the wood. A small lead 

 pipe will convey the water down the inside angle of the build- 

 ing into a drain or tank ; the rafters are five inches by three 

 and a half inches, and have a beading braded on to their under 

 side, and a capping on the top, for the double purpose of keep- 

 ing the roof lights in their place and the water from getting 

 into the house; but in addition to the capping, the lights 



a 



^ 



must have screws (Fig. 9 h), commonly known as bed-screws, 



