By Mr. John West. 



between the bushes and the mould ought to be quite dry 

 when they are used for this purpose : I recommend a thick 

 stratum of leaves, if they can be obtained. The mould may 

 be put in directly after the leaves are laid on the bushes, 

 and should be sloped, to correspond with the inclination of 

 the glass lights. 



I remain, Sir, 

 Your most obedient humble servant, 



John West. 



Castle Ashby, 

 September 5, 1819. 



References to the Plate. 

 A A. Doors at the back of the dung chamber. 

 BBBB. Grooves in which the doors are fixed. 

 C C C C. Areas sunk in the earth in front of the doors. 

 D D. Bar at bottom of the chamber, to serve as a guide in 



filling in the dung. 

 E. The chamber half filled with dung. 

 F F F F. Holes to let the heat pass from the chamber into 



the cavity. 



G G G G. Cavity surrounding the bed, the sides of which 

 are tied together by bricks, as represented. 



H. Iron bars at the top of the cavity, to support the bushes, 

 leaves, and mould ; the ends of these are shewn by 

 the white marks in the longitudinal section, Fig. 3. 



IIII. Stratum of bushes laid across the bars, and covered 

 with leaves. 



KKK Mould laid upon the leaves. 



L I.. Plugs in the back wall, to let the steam pass off when 

 necessary. 



