43 THE GRAPE. 
tg the lower part, or front, cold; which, if there be a dif. 
terence, 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 
as heanereese tion 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 
Fig. le 
gientana, 
AH] 
SS 
4 
