MARCH, I911.] THE ORCHID REVIEW. gt 
ORCHIDS FOR THE CATTLEYA Hovse. 
This house should contain the principal species of Cattleya, Lelia, and 
their beautiful hybrids, Cypripediums, Dendrobiums, and Vanda ccerulea, 
which would form an ideal collection with which to begin Orchid culture. 
PosITIONS. 
At the warmest end of the house place the Dendrobiums and hybrids of 
Cattleya Dowiana aurea, chocoensis, Eldorado, and superba, also Leelia 
elegans, and at the coolest end Cypripediums, Vanda ccerulea, Cattleyas 
citrina, Harrisoniana, Loddigesii, with Lelia anceps, autumnalis, and 
prestans. 
WoRK FOR MARCH. 
WaTERING.—As the days lengthen give more water to the. plants. To 
all in flower and in active growth, it will usually be required once a day, 
but to those resting every three or four days. Only pure rain water must 
be used for direct application to the plants. Place any Orchids that are 
resting by themselves at the coolest end of the house. Damp the floor and 
staging three times a day when the weather is fine, and once, about eleven 
a.m., when dull. Many Dendrobiums will now be pushing their flower 
buds, and should receive more water and light. 
Report any Cypripediums which have finished blooming, using a 
mixture of loam and crushed crocks. 
Keep newly-potted plants shaded till well re-established. Although many 
Leliocattleyas may now require repotting, I should advise amateurs to 
leave it till April, as we frequently have cold weather at this time, and 
after repotting, an increase in temperature is beneficial. 
SHapING.—Being for the most part sun-loving plants, the inmates of 
the Cattleya house will not yet need any shading, except the Cypripediums, 
and for these it will be found advisable, during the middle of the day, to 
throw a mat over the roof-glass under which they are grown. 
Herat.—The following average temperatures should be maintained : 
Day, 65°-75° Fahr. (sun heat) ; Night, 60°-65° Fahr. 
VENTILATION.—Owing to a higher temperature being necessary here 
than in the Cool house, air cannot be admitted in as large quantities, but it 
is essential that fresh air be admitted, hencé the need of keeping up the 
prescribed temperatures, to allow the ventilators being open for a few hours 
at least every day. Those on a level with the hot-water pipes should be 
opened at about ten a.m., and directly the temperature rises to 68° Fahr., 
while those at the roof should be slightly opened, increasing the amount of 
air in proportion as the thermometer rises. 
Next month being the beginning of the busiest season in Orchid culture, 
owing to so much repotting then being done, I shall hope to explain clearly 
the method of potting the various genera. 
