THE GRAPE. 



Fig. 14. 



ing the lower part, or front, cold ; which, if there be a dif- 

 ference, ought to be the warmest. The only way in which 

 this plan can be tolerated, or be of 

 advantage, is, to combine the cham- 

 ber and flue, and make use of both. 

 This is economizing, as the whole 

 of the heat which radiates from both 

 sources is made available. Figs. 13 

 and 14 show a longitudinal and 

 transverse cross section of both com- 

 bined. 



In concluding, we may say, that 

 after many years' practice with most 



kinds of heating apparatus for hot-houses, we are thor- 

 oughly convinced that none is so efficient or economical 

 as hot water, and have never found any on that principle 

 to supercede the boiler, as exhibited in Fig. 12. 



