XX 



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Fig. \. A ground plan of five pits, 75 feet in length and 7 feet in width, sunk to the deptli 

 of 4 feet. B, boiler (technically called a saddle-boiler) ; C, space for two main-pipes which 

 spring directly from the boiler, "and from which is conducted a (low and return pipe between 

 every divisional space marked D ; the lower part of each division is rilled with rich soil to 

 the depth of 2 feet ; the sides of the pits have holes ^termed pigeon-holes) ; the upper space 

 of 2 feet is left vacant for the radiation of heat from the pipes. The divisions are 20 inches 

 across. 



Fig. 2. A section of two pits, showing the beds, pipes, and roof ; which last, as above stated, 

 is composed of wood. 



Plan and Section of Asparagus Pits in H. M.'s Garden at Frog- 



MORK, REFERRED TO AT P. XIX. 



