EXPLANATION OF THE PLAN, 



^ a Pits for the plants. See the method explained 



in page 72. 

 i b Two courfes of brick-work : One of them laid 



under the tiles which cover the flu^s, and the 



other laid above theni, 

 C c The flues. 

 4 d Four-inch brick- work carried up full of holes or 



apertures. 

 ^ e Brick on edge, carried up folid to the top of 



the flues. 

 f f Four-inch brick-work carried up folid to the 



top of the flues, 

 g Drain that carries off the water from the bed. 

 h h Apertures or holes which are all round the 



bed, and through which the (team and heat of 



the linings enter theilues to warm the air in 



the frames. 

 f i Small holes or drains ; thefe are at the bottom 



of each pit, and are to drain the water from 



the mould of the pits. 

 I k South fide of the frames on which the lights refh 

 ; Light. 

 VI m Two courfes of tiles which cover the flues, the 



ends of which extend to the outfide of the 



brick-work. 

 ^ n Foundation of the bed, which is under ground, 

 4? End of the frames, 



I have given the plan of a bed for fix lights onlyj 

 but a bed may be extended to any length or fise r€^ 

 quired by the fame model. 



