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 sketches 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 pa^e. 

 15* 



