GREENHOUSES ATTACHED TO DWELLINGS. 67 



In the diagram of an end section of a simple house, 

 figure 20, the sashes (JB and O) are 3 feet wide by 6 

 long ; the top one is so placed that it can be let down 

 over the lower one by weights and pulleys, and thus secure 

 ventilation. The front wall and ends are best built by 

 using 4 x 6-inch locust or cedar posts. Upon the out- 

 side of the posts rough planking is nailed ; against that a 



Fig. 20. SECTION OP A CHEAP GREENHOUSE. 



layer of tarred paper ; and against the tarred paper the 

 weather boarding is nailed, either overlapping or tongued 

 and grooved, as may be desired. The outer walls of all 

 green-houses built of wood are now thus made with us, 

 and it is found to be far preferable to the old and objec- 

 tionable mode of filling in between the boards with saw- 

 dust or shavings. 



The tarred paper is a good non-conductor, and we find 

 walls so constructed are equally as good a protection 

 against frost as a nine-inch brick wall, which would cost 



