462 
PLAN OF A NEW FORCING-PIT. 
the ground, surrounded by a wood curb, by which the introduction 
or removal of the dung is performed. The pit is erected North and 
South. Through the centre of the pit is a walk 2 feet in width 
marked C, including the parapet walls ; at the south end of the walk 
is a cistern 2 feet square, marked B. The parapet walls are single 
brick, the height 6 feet, including the curb ; the walk is raised 2 feet 
for the convenience of reaching over the walls to do what is necessary. 
The supporters of the bed are cast iron bars, 20 inches apart, with a 
ridge in the middle on which slate or tile is placed, bedded in lime 
morter, so that any racid dung may be used without injury. A small 
fire flue marked E, is carried round above the dung chamber; at the 
north end above the furnace is a ventilater marked J, for rarifying 
the air. Through the centre of the pit is a small tin pipe, marked 
K, fixed to the top full of small holes, with a ventilator at each end, 
also marked J, lor the condense air to pass off, a set of small sashes 
marked L, 1 loot deep for the admittance of more air when necessary, 
hung with joints at the top. The bottom convenience are small iron 
bars, with holes, as in use, the depth of soil from 20 inches to 2 feet 
upon the slate or tile; the walk may be considered a loss, but when 
considered by a professional Gentleman will no doubt appear very 
advantageous. The plants are to be trained up under the glass and 
over head, the steps into the shed are marked G; the letter P is a small 
spout to receive the water from the roof to which is attached a lead 
pipe marked O, to conduct the said water into cistern B. The letter 
T, are the steps into the walk, the letter F furnace, N, the plugs for 
the convenience of cleansing the flues. 
