282 Improvement in the Construction of Hot-beds. 



scrihe and to recommend, abundant air may be given at all 

 times; and so high a temperature preserved, that, with a 

 hot-bed of a very moderate degree of strength, the most 

 tender plant will be perfectly protected without any other 

 covering than that of an ordinary glass light during the 

 severest frost of our climate, provided the spaces, where the 

 panes of glass overlap each other, be perfectly closed. 



The annexed design will give a sufficiently accurate repre- 

 sentation of the apparatus which I have above recommended. 



A, B, C, D, is a hot-bed, resting upon an inclined plane of 

 earth. E, the frame. F, G, a pipe, made of a slender oak 

 pole ; and H, I, K, smaller pipes fixed into the larger one, 

 through which the air which enters the latter at F, ascends into 

 the hot-bed. The tube of the large pipe is one inch and a half, 

 and that of the smaller three-quarters of an inch diameter. 

 The smaller tubes have near their upper ends two horizontal 

 apertures, through which the heated air passes laterally into 

 the frame. I consider three of the large pipes to be fully 



