28 THE ORCHID REVIEW. 
CALENDAR OF OPERATIONS FOR JANUARY. 
By H. A. BURBERRY, Orchid Specialist, King’s Heath, Birmingham. 
WitH the gradually lengthening days we may soon look for signs of 
renewed activity in our collections, but during the present month the winter 
treatment must be continued, so far as temperatures and watering are 
concerned. The following temperatures should be maintained as nearly as 
circumstances will permit :— 
Cool House.—Day, 50° to 55°, with sun, 60°; night, 50°; morning, 
45° to 50°. 
Intermediate House.—Day, 58° to 63°, with sun, 66°; night, 56° to 58°; 
morning, 53° to 56°. . 
Cattleya and Mexican House.—Day, 60° to 65°, with sun, 68°; night, 
58° to 60°; morning, 55° to 58°. 
East Indian House.—Day, 65° to 70°, with sun, 75° ; night, 65°; 
morning, 60° to 65°. 
These figures should be maintained as nearly as possible, but due regard 
should be taken of the fluctuations of the temperature outside. If the 
weather be cold, do not attempt to reach the higher figures by excessive 
firing, which would do more harm than good. During a spell of severe 
weather the fire-heat may be economized by letting the blinds down at 
night, or laying mats or other coverings on the glass, which, however, 
should be removed in the day time, as it is important that the plants should 
receive all the light possible at this dull season. 
Ventilate as freely as possible during mild weather, chiefly by means of 
the bottom ventilators, for a stagnant atmosphere is injurious to the plants. 
Do not let the atmosphere become dry, but damp the paths and walls once 
or twice a day, according to the amount of fire-heat used. Watering 
operations must still be carried on with caution, and much the same as 
last month. Keep a sharp look-out for insects, for cleanliness is of the 
highest importance, and a little extra attention in this direction will 
save much labour hereafter when time is more valuable. Slugs and 
cockroaches must be kept down at all costs, for it is useless to attempt 
to grow Orchids in a house infested with these pests, which devour 
young roots, flower spikes, and almost anything else without mercy. A 
little cotton wool placed round the base of a flower spike will often pre- 
serve it. from these marauders. 
In the Cool House many things are at rest. The principal work 
will be to give due attention to watering aud keeping the atmosphere 
in a healthy condition. Those plants which are commencing to grow 
should be kept rather moister than before, and any that are making active 
growth, such as Ada aurantiaca, will benefit by rather more liberal treat- 
