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carried out upon correct principles, combined with 

 economy. 



At Bicton there is a pit for growing succession 

 plants, in compartments of six lights ; and generally 

 some late pines in the season are fruited in one com- 

 partment. These are often started, bloomed, set 

 evenly every pip, and have surpassed the swelling of 

 those in the house or stove, which has been kept at 

 night from 68 to 72 degs., with the assistance of hot- 

 water pipes, capable of commanding any required 

 heat, while those in the above pit have nothiug more 

 than a lining of well-wrought leaves, a little stable 

 dung amongst them, and covered at top with dried 

 short grass, placed against the wall to the top. But 

 do not mistake the principle upon which this lining is 

 applied to heat both bottom and top, because long 

 practice in those matters has pretty clearly pointed 

 out to us the simple principle is a good one, for fur- 

 nishing a humid kindly bottom heat of warm air, also 

 a kindly-heated humid atmosphere about the interior 

 of the structure, to circulate among the plants. This 

 pit was constructed by Mr. Barnes's predecessor, for 

 containing the large body of three or four feet in 

 depth of hot tan, for furnishing the then requisite 

 bottom heat ; and because there should be no mistake 

 in the application of it, the pit, or rather walls of the 

 pit, were constructed with pigeon-holes all round, to 

 the height of three feet six inches, or thereabouts ; 



