Juty-Aucust, 1920.) THE ORCHID REVIEW. 107 
suitable conditions, hence the necessity of watchfulness, especially in the 
small details of cultivation. 
WaATERING.— Well rooted plants at this season will take up considerable 
supplies of water, whilst newly potted plants, and feeble rooting varieties 
must be watered with caution. 
PotTinG.—In most establishments this season there has been a great 
amount of repotting to be done, owing to the arrears which accumulated 
during the war, the scarcity of material and other causes. No plant can 
make satisfactory root growth in a sour, decomposed material, hence the 
necessity of repotting when the material becomes in that condition, if the 
best results are to be obtained. A sweet healthy compost is of the first 
importance, followed by a judicious use of the water pot, and the best result 
can be looked for. In repotting any plants it is advisable to do them just as 
they are about to push forth new roots, which will prevent them from 
losing their leaves, and suffering as they invariably do whenever potted ina 
haphazard manner. 
- CYPRIPEDIUMS of all sections that are well rooted, must from now 
onwards have copious supplies of water, as if allowed to become dry they 
are readily attacked by thrips, which soon disfigure their young tender 
foliage, and flower spikes when they begin to push up. During fine, bright 
weather, these plants may be syringed, or sprayed, which will help to keep 
attacks of insect pests down and the plants clean. Soft, tepid water, 
should enly be used for this purpose, as hard or dirty water leaves a deposit 
on the leaves. The C. niveum section was dealt with last month. 
SOBRALIAS are easily grown plants, but resent disturbance at the roots, 
therefore should have special care when potting becomes necessary. When 
they cease flowering, any that are in need of new material should have 
attention. A mixture of good fibrous loam and peat, of a similar nature to 
that used for Cymbidiums, makes a suitable compost. They should be 
potted moderately firmly, and water must be sparingly applied to them 
until the new roots get into action. Sobralias thrive best inthe Cattleya 
house, and when their growth is completed enjoy a fairly dry resting season, 
but having no pseudobulbs, this should not be carried to excess. An 
occasional spraying will be the means of keeping the plants clean, and 
preventing insect pests. 
CATTLEYAS AND ALLIES.—Many species of Cattleya, Lelia and their 
numerous hybrids have recently passed their flowering stage, and those 
plants that need repotting should be attended to when the plants are about to 
make new roots. The idea of potting all the members of this large family 
at one season is now obsolete, and rather than let the plant bein a starved 
condition, it is much better to repot it, irrespective of season. Much. 
valuable time may be gained in this manner, and a host of plants done, instead 
