70 THE ORCHID. REVIEW. [Marcu, 1912. 
can naturally be admitted, but the atmosphere of the house should always 
feel fresh, and this end may be attained by opening the bottom ventilators 
whenever the thermometer registers slightly above the lowest figure for the 
day (65° Fahr.). When the sun warms the air about midday, the roof 
ventilators can generally be opened slightly, and the amount of air thus 
given can be xradually increased in proportion as the thermometer rises. 
The house should be well damped down, once at 9.30 and again at 3 p.m. 
Paths, staging and pots should be thoroughly wetted, but do not yet syringe 
the plants overhead. Providing plenty of atmospheric moisture be 
maintained, the plants in this structure will require less water at the roots 
than those of the Cool house. 
The main occupants of this house will be Cattleyas, Lelias, and their 
many hybrids. At this season water all growing plants about three times a 
week, those in flower and bud usually four times, but once a week will be 
ample for any which are dormant. If cold and dull weather prevail, twice 
a week will often suffice for both growing and flowering plants. If you are 
in doubt as to whether an Orchid needs water or not, leave it until the 
next time, and, as remarked last month on watering Cool house Orchids, 
always give enough at each application to thoroughly wet the whole compost. 
Vanda ccerulea, Angraecum sesquipedale, and other Vandeous Orchids 
possessing no pseudobulbs must have more water, if in full growth about 
three times weekly. 
Dendrobiums passing out of flower may receive water as advised for 
Cattleyas. If any need repotting, this should be attended to at once. 
Knock the plants out of the old pots, cut off all dead roots, and all weak 
bulbs may be removed. Three old bulbs can be left to support the new 
growth, but above this number they tend to exhaust nourishment from the 
fresh lead, and consequently are detrimental. For compost use a mixture 
of osmunda fibre and sphagnum moss, and be careful not to bury the plant 
too deeply, nor to pot it too lightly, so that it sways about. A few sticks 
tied to the pseudobulbs may be employed to hasten a good hold being 
taken on the compost. 
SUGGESTED ADDITIONS. 
ODONTOGLOSsUM WILCKEANUM.—For an Amateur’s Cool house, this 
magnificent hybrid ranks as one of the best. Occurring wild, and having 
also been raised by hand, it can consequently be procured at a com- 
paratively low price. The flowers are of good size, and freely borne on long 
arching spikes. The sepals and petals are usually cream or yellow, but, in 
all cases, more or less blotched with reddish brown. The lip is similarly 
coloured, with a handsome crest. There are numerous fine varieties of this 
Orchid. 
SOPHRONITIS GRANDIFLORA.—This little gem is almost too well known 
