EXPLANATION OF THE PLATES. 
Plate I. 
Fig-. 1 . Great Laboratory, with the Hall or anterior Apart- 
ment. 
a. Six doors ; three of which lead into the hall, and three 
into the great laboratory. 
b. Six windows, having each a ventilator placed on a 
level with the floor, opening at will. 
c. Small room or passage, in which is a trap or semicir- 
cular opening, by which the dung is cast out, and the leaves 
brought in with a pulley. 
d. Six ventilators in the floor of the great laboratory, to 
facilitate the circulation of air. 
e. Windows, under which ventilators are placed, in the 
hall or anterior apartment. 
f Figures, giving an idea of the regular disposition and 
manner of placing the hurdles, wickers, or tables, in three 
lines or rows. 
g. Stove. 
h. Six grates or fire-places : — 
1 . Large stoves for drying the leaves in this apartment. 
2. Valves with a small cord in the centre, and two knots 
keeping the valve open ; the cord is fastened to a large 
nail with a knob head, fixed in the middle of the window- 
seat. 
3. Sign showing the spot where the thermometer and 
lamps must be fixed ; the former arc fixed in the lower part 
of the wall, between the windows, and the latter in the upper 
part of the wall. 
