NoveMBER, 1915. ] THE ORCHID REVIEW. 333- 
the temperature wholly by means of the lower ventilators, opening those on 
the leeward or opposite side to the wind. 
CATTLEYAS.—At the present time Cattleya Bowringiana, C. labiata, and 
many of their hybrids form the chief attraction in this house, and nearly all 
of them are well worth growing, their flowers being of a rich colour and 
producing an excellent effect, especially by artificial light. After flowering 
these plants should be arranged in a cool, light ‘position in the house, 
and where air will circulate freely around them. While at rest much care’ 
is needed in watering, for if the potting materials be kept constantly moist, 
or made too wet when the plants are watered, it will oftentimes cause the 
pseudobulbs to turn black and decay. Repotting may be done so soon as- 
new roots are seen pushing out from the base of the last-made growths. 
Plants that have made their full complement of roots, either before: 
blooming or when in flower, should be repotted soon after growth recom- 
mences. The earlier-flowering C. Gaskelliana, although its roots are 
growing and extending, should not be disturbed by repotting at this season,- 
but in spring, when the new growths will appear. C. Lawrenceana is 
generally late in starting to grow, and, owing to lack of sunlight and natural: 
heat, makes comparatively slow progress; it is therefore advisable to elevate 
each plant well up to the roof glass, where they may obtain all the sunlight 
possible, the smallest plants being suspended near to the roof. Whilst 
making their growth during winter, a rather dry position in the Warm: 
house is a suitable place for them, but at no time must they be kept 
saturated with water, as the young breaks are apt to decay from this cause, . 
therefore a great deal of discretion must be used. When the new growths 
are fully matured very little water will be. needed to keep the pseudobulbs- 
plump, a slightly increased quantity being applied when the flower spikes: 
begin to push up through the sheaths. Plants of C. Percivaliana, having 
completed their pseudobulbs, should be kept moderately dry at the root,. 
Over-dryness causing either abortive flowering or deformed flowers. Plants 
of this species should also be raised well up to the roof glass. ia 
Disas.—Disa grandiflora, racemosa, and the hybrids, Weitehit, 
langleyersis, kewensis, Premier, &c., are now sending up their young 
shoots, and will require to be repotted. When breaking up large crowded: 
pots or pans, of these plants, great care is necessary, or many of the roots, 
which are extremely brittle, will be ruined. The strongest breaks, which 
are to be grown on to bloom first, should have all those long white root-like- 
offsets cleared from them. Such offsets, if kept, will make tubers and roots 
for themselves, and thus increase the stock, but in their earlier stages they 
are dependent upon the same tubers which support the flowering growths. 
In re-making up specimens, select growths of uniform size, so that they 
will all flower together, and thus make a good show. Where space is of 
