PINE-APPLE. 345 
which promote its circulation. The bed e, in which 
the plants are plunged, is suported by a framework of wood, 
resting on brick piers between the troughs. A boiler 
placed in the centre is sufficient for a range of sixty feet. 
Pits such as these have been in successful operation for the 
last two years in the gardens of the Earl of Hopetoun, and 
were designed by Mr. Charles H. J. Smith, landscape gar- 
dener and garden architect, of whose assistance the writer 
of this treatise has had much satisfaction in availing him- 
self, in the designing of the illustrative sketchés and dia- 
grams. Mr. Smith also proposes another form of a suc- 
cession-pit, exhibited below, entirely heated by hot water. 
Fig. 41. 
The surface-heat is supplied by pipes in front; the bottom- 
heat is kept up by small pipes from the boiler, passing 
_ through cisterns of water extending the whole length of 
the pit. In this case it would be necessary. to apply the 
heat only during the day. The only succession-house, or 
that generally in use till within the last fifteen years, does 
not differ materially from the common pine-stove: but, 
owing to its great waste of heat, it either is or ought to be 
entirely laid aside. 
In the fruiting-house, more room, greater height, and a 
more powerful temperature, are requisite; and to attain 
these objects, many varieties of structure have been de- 
vised. We shall notice those only which are most worthy 
of attention, The first we shall mention is Baldwin's 
fruiting-pit, of which a section is given on the next page. 
15* 
