360 Description of a Pit for raising Cucumbers, $c. 



The bottom of the boiler should be entirely exposed to the 

 action of the fire, but not the sides or ends ; immediately 

 over the part where the steam tube enters the chamber, the 

 floor of the bed should be double, to guard against an excess 

 of heat, directly as the steam issues from the boiler. The 

 cover being of cast iron, its own weight will be sufficient to 

 keep it down, but it should fit so close as not to permit the 

 steam to escape. 



