OF THE PINE-APPLE. 



In order to preserve the flues, there should 

 always be a sufficient number of fire-places, by 

 which means the fires need not at any time be 

 made so strong. When the roof of the hot-house 

 is covered, one fire will suffice for about seven or 

 eight hundred square feet ; but where no covering 

 is used, it will not give a proper heat to more than 

 five or six hundred feet : so that the number of 

 square feet contained in a hot-house being known, 

 the number of fire-places required may be easily 

 ascertained. 



Some persons who give designs for the building 

 of hot-houses, allow a fire to work a much larger 

 space than I here recommend, in order to make it 

 appear that the expense in fuel will not be so 

 great ; whereas, in fact, the case is quite the re- 

 verse ; for I can venture to assert, that one fire 

 worked violently, will consume more fuel than two 

 that are worked moderately ; the latter will also 

 heat the house more regularly, and never be pro- 

 ductive of the bad effects which attend the former, 

 as I have already shown. 



Hot-houses that are new built, require much 

 less fire than those that are old, and consequently 

 in worse repair : in the former there is seldom 

 occasion for the fires to be continued longer than 

 the beginning of May, yet there are sometimes 

 instances of fires being requisite, even in the sum- 

 mer months ; not only in respect of the weather, 

 but in order to promote the ripening of late- 

 shown fruit. 



u Z 



