THE FORCING GARDENER, [2. I. 



flue heated to a much greater degree than 

 required. 



In thefe furnaces, the fire will not laft 

 above three or four hours ; which, in 

 ftormy weather, and in Winter, occafions 

 a conftant attendance, perplexity, and the 

 impoilibility of regulating 3, climate in 

 the bpt-houfe. But all thefe objections 

 are obviated by the furnace as here re- 

 prefented. Here the grate does not oc- 

 cupy one-third of the fpace allotted for 

 the fuel, and, dt the fame time, is fuffi- 

 ciently large to kindle the whole mafs > 

 which, when kindled, will keep of a mo- 

 derate and equal temperature for many 

 hours together. Here, alfo, the operator 

 is not troubled with frefh lighting the 

 fires every day ; I have frequently 

 known them to keep fire for ten days to- 

 gether without any addition of fuel. My 

 method of regulating and working this 

 furnace is as follows : 



As after the firft lighting for the fea- 

 fon, there is always fire remaining in the 

 t>ack part of the furnace, in kindling-up in 

 the evening, &c. clear all the afhes from 

 the grate, and the fpaces at the fides 



of 



