GREENHOUSES, HOTHOUSES, FORCING-PITS. 



253 



6S6. In a range of buildings like the present, in -which pits occupy both 

 sides of the houses, it is obvious that the nearer they range from north-west to 



IX.— GEOUND-PLAN OP HOUSES AND PITS. 

 AA. Flan of Stage. e. Central Walk. cc. Cold-pits. DD. Sot-pits. 



south-east, the more equally will the light and heat of the sun be distributed 

 to them. The site being fixed upon, Mr. Messenger's estimate includes the 

 foundations, walls, and air-drains : external drains, of course, are contributed 

 by the proprietor. The walls of the greenhouse and forcing-house are three 

 feet below the ground-level, and three feet above, of nine-inch brickwork. 

 The greenhouse is paved with stone, having a central stage and vacant space 

 all round : the forcing-house has a central path four feet wide. Tanks for 



