.12.] EXPLANATION OF THE PLATES. 23$ 



and are alfo heft adapted to the purpofe of 

 fteaming, where required. The foles of 

 the flues fhould be iupported from their 

 foundations, in order that the heat may 

 efcape from under them, and be diffufed 

 through the houfe. A cavity of three 

 inches is diffident for this purpofe 3 but 

 the wider the 1 paces between the pillarets, 

 the better. Confequently, where pave- 

 ment-flags can be had, they mould be 

 ufed ; if not, large tiles fhould be made 

 purpofely. 



Where fire-brick and fire-clay can be 

 procured, all hot-houfe furnaces, and about 

 ten feet of the flue next to them, fhould be 

 built therewith. This is more expenfive 

 at fir ft j but in the end will be found to be 

 a great faving, as they will laft for many 

 years without needing repair. 



Neat wooden or leaden fpouts fhould be 

 carried under the eafing, and conducted 

 to a ciftern placed in fome convenient part 

 of the hot-houfe. No water is equal to 

 that which fells from the heavens ; and 

 a very confiderable quantity may be col- 

 leded in this way. 



In 



