Account of a Plan for forcing Grapes in Borders, &c. 455 



however, that the parts appropriated to the dung and earth, 

 were retained within the house ; but calculating, that, in the 

 extended space, the air would not be sufficiently heated by 

 the dung only, I likewise introduced a flue to be worked 

 when necessary, with fire. Annexed is a sketch of a front 

 view of one of these pits, and a section of the same. Figure 1. 

 is the front view, and Figure 2. the section. 



References to the Figures. 

 A A. Doors for introducing dung into the Pit. 



B. The border of earth in which the Vines are planted. 



C. The dung in the Pit, under the earth. 



DD. Iron joists, supporting a covering of stout slates. 



EE. The Vines planted in the earth, and trained under the glass. 



The dung is introduced through small doors, from the 

 exterior. To each pit, there are two of these doors; 

 through one of which half the pit is first nearly filled 

 with dung; a week afterwards, the remaining half is 

 also nearly filled through the other; in another week, 

 fresh dung is added to the part first filled, and the same 



