each other, and they do not begin till the fifth row of 

 bricks from the bottom. When the pit is intended 

 for early cucumbers or melons, and the lower part is 

 consequently to be filled with leaves or tan, the holes 

 in the bricks should only be made above the surface 

 of whatever may be put into the pit, or, if previously 

 made low, must be closed. 



A, sliding lights ; B B, wall plates ; C, water- 

 groove ; D, Hollow wall ; E, dung linings ; F, air 

 funnel. (Knighfs Papers, 262.) 



Mr. J. Macnaughten employs pits heated by tan, 

 and obtains additional warmth, when required, by the 

 aid of dung linings. 



The pit is 1 8|- feet long, by 6 feet in breadth ; the 

 height of the back is 5 feet ; the height of the front 

 3 feet 9 inches ; the declivity for the glass 1 foot 3 

 inches. The pits for the dung are on the outside of 

 the frames, and sunk level with the surface of the 

 earth, or gravel, on the outside. The height of these 

 pits is 3 feet, their breadth 2 feet. The outside of 



