BOOK I.] INTRODUCTION- 5 



For inftance, if a furnace (hall be placed 

 at one end of a capacious houfe, which with 

 difficulty can be raifed to the degree re- 

 quired on a fcale hung in the middle, will 

 not the end of the houfe whereat the fur- 

 nace is placed, be over-heated ? and will 

 the other end ever rife to the degree re- 

 quired, before all other parts of the houfe 

 be over-heated ? Is not this both a wafte 

 of fuel, and a thwarting of intention ? 



And what faving is there in the firft on- 

 fet ? or rather, what wafte is there by 

 rending the furnace and flue with immode- 

 rate heat ? Is there an inch of flue lefs f 

 There is, to be fure, a grate and furnace 

 more, which may coft (bme forty or fifty 

 (hillings ; but which will, in one feafon, 

 be repaid by the faving in fuel. Nor will 

 either flue or furnace require any repair 

 for many years afterwards. 



But, laying all confideration of expence 

 afide, if it is found that a hot-houfe may 

 be more fteadily worked with two furna- 

 ces than with one, Why not ereft two ? 

 Does the trifling fum of a few (hillings 

 in any meafure weigh with the infurance of 

 fuc-cefs, in the production of good crops ? 



A 3 I 



