So CN TW5 CITLTURE 



th'ng elfe, provided there be a fulTic'cnt heat kept 

 in them. 



The bed is fo conllruded, that the coldeft place in 

 it is exactly in the centre of each pit, and from this 

 centre the lieat increafes on each fide to the lininr s 

 where the heat begins. The plant being p-i-icfed 

 in this centre or coldeft part of ihe bed. h::: roots 

 can never be hurt by the heat; and ^^ i. is n-uural 

 for the roots to fpread themfelves be lizont'diy, the 

 hear, increafing on each fide gradually, is in every 

 refpecl fuirable for their increafe and extenfion. 



The hear in the centre of each pit, juft where 

 the plants are firft planted, feldom rifes higher tlian 

 to about Bo or 83 degrees, nor doe? it ever rife 

 higher in any part of the pits than about 96 or 97 

 degrees, nor do I bch'eve ii ever can be laifed higher 

 than that, without fcorching the plants by top heat or 

 heated air ; whereas in a bed made of dung, the 

 heat in the centre of the bed under the mould in 

 v/hich the plants are planted, frequently rifes to 

 above 120 degrees, when, at the fame time, the air 

 in the frames can fcarcely be kept up to a proper de- 

 gree of heat ; This frequently happens in cold weather 

 in winter. 



" 1 he fcorching sheat of a hot-bed of horfe-dung, 

 when too hot for plants, is equal to 85 degrees and 

 more, and hereabout is probably the heat of blood 

 in fevers. 



'^ The due healthy heat of ahot-bed of horfe-dung 

 in the fine mou d, where the roots of thriving cucum- 

 ber plants were in February, was equal to ^6 degrees, 



which 



