150 A FEW HINTS ON THE MANAGEMENT OF TERRESTRIAL ORCHIDEJE. 
The soil most suitable for them is light maiden loam and peat earth, well 
mixed, and made open with sand. 
The best time to remove the roots is at the time they are in flower ; they may 
then be packed in moss, and sent with safety to almost any distance. 
The house appropriated to the growth 
of Orchideae at Chatsworth (see figure), 
is 75 feet long, and 12 feet 6 inches 
wide. The walk, a a, is composed of 
pieces of wood nailed to sleepers, and is 
3 feet 6 inches wide. The flues are in- 
closed in hot air chambers, b b, and the 
heat is admitted into the house by means 
of sliding ventilators, c c, on each side 
of the walk. 
On the top of the hot air chambers 
the plants are placed, as seen by letter d 
in the section ; the stones covering the 
chamber being always warm, give a 
gentle heat to the roots of the plants 
placed on them. The top of the air 
chambers is 2 feet 6 inches above the 
level of the floor. 
The letters e e e show three leaden 
water cisterns; the two end ones are 
3 feet square, the centre one 3 feet wide 
by 8 feet long, and is occupied by 
aquatic plants. 
There are four fire-places {fff) on 
the common principle, the two end ones 
pass into the front chamber, cross under 
the walk in the centre of the house, 
pass along the back chamber, and empty 
themselves at each end, g g. The two 
fires in the back wall, pass once along 
the front of the back chamber, and 
crossing through the wall at each end of 
the house, pass along the outside of the 
wall, and heating the back sheds (h) 
empty themselves in the centre of the 
back wall of the house at/! 
