48 THE GRAPE CULTCRIST. 



the more it rises, the more rapidly the smoke and heat will 

 pass. The size of the furnace will depend upon the size 

 of the house, and also whether coal or wood is used. 



TO MAKE THE FLUES. 



Lay a row of bricks flat and crosswise, where the flue is 

 desired ; on the ends of these place two others on their 

 edges, and across the top lay a row flat in the same 

 way as the bottom ones were placed. This gives the 

 dimensions of the flue four inches by eight in the clear. 

 But a larger flue is better, say six by eight inches, for a 

 house of fifty or more feet in length, and it is also better 

 to cover the top of the flues with the ordinary inch tile, as 

 the heat passes through these more readily than through 

 brick. No correct estimate of the cost of building a prop- 

 agating house, of either of the styles named, can be given, 

 because the price of the materials entering into their con- 

 struction is continually changing. 



