GENERA AND SPECIES 107 
satisfactory condition of many of them in gardens. Each 
section should be watched, and, when growth is completed, 
a change should be given to a cool, intermediate house 
for acouple of months. Aérides, Vandas, and Saccolabiums 
suffer most from being kept too hot and close in winter. 
After spring opens the amount of heat and moisture 
should be gradually increased. Directly they have flowered, 
the tall plants which have lost their bottom leaves 
should be lowered in the pots or baskets by being cut 
off at the base. Dwarf-growing species should be brought 
well up to the light. V. cerulea grows well under the 
most dissimilar conditions, and with it, as with many other 
Orchids, there is more in finding a suitable place than in 
growing the plant. All require to be potted or basketed 
in Sphagnum-moss. Some growers add a sprinkling of 
leaves. The V. teres section may be planted in Sphagnum- 
moss in a warm corner of the house, or against the end 
of the house. If grown in pots, three or four should be 
potted together and trained to a stout stick or teak rod. 
Zygopetalum.—Under Zygopetalum, several distinct 
sub-genera are included. The largest-growing and showiest 
species include Z. Mackayi, Z. crinitum, and other related 
species. ‘These should be potted in peat, Sphagnum-moss, 
and loam fibre in equal proportions, with a sprinkling of 
leaves, and fine broken crocks added. During the grow- 
ing season occasional waterings with weak, liquid manure 
should be given ; and, after flowering, a rest with restricted 
water supply. Those that need repotting should be attended 
to before growth begins, but they will remain satisfactory 
for years in the same pots if carefully treated. 
There are many hybrids, especially of Z. mawillare, 
