THE ORCHID REVIEW. 149 
previous Calendars, though as much light should be given them as possible. ° 
Sun heat. is very beneficial at this period if well tempered with free and 
unstinted ventilation. The blinds should be drawn up early in the after- 
noon, the house thoroughly damped down, the plants slightly sprayed over- 
head with soft water, and the ventilation reduced according to the weather. 
If mild, it is best to leave some air on all night, as cool nights and hot 
days is the natural order in their native habitats. 
For the warm houses a little fire heat will still be required during the 
night, and perhaps also by day; and should the weather be cold and 
unseasonable, a little may also be used with advantage in the intermediate 
houses. Keep a sharp look out for thrips and other insect pests, preventing 
their increase by timely fumigation. When using insecticide beware of 
having it too strong, and on no account should any be allowed to lodge in 
the young tender growths, as it is extremely dangerous, and quite unneces- 
sary, as a dusting of tobacco powder is safe to use and very effectual in 
dislodging thrips from such places where smoke cannot reach them. 
Heat and moisture are quite indispensable for Dendrobiums and other 
East Indian Orchids. The former should now be in active growth, and all 
necessary work in the way of repotting or top dressing finished. Ours, 
except where the plants are too large, are suspended near to the roof glass, 
where they receive the greatest amount of light and a free circulation of 
air, As a general rule I find it safest not to syringe these Orchids, for 
where many different and choice species are growing together it is quite 
easy to have misfortunes, by the rotting of young growths, or the sudden 
termination of the new pseudobulb, caused by the water lodging in them. 
The atmosphere, however, cannot be kept too moist if the shading and 
ventilators are properly manipulated. It is a genuine pleasure to the 
cultivator to see his plants nicely arranged in their growing quarters, and 
looking healthy and comfortable in a warm, moist, and well-balanced 
temperature. 
Many species of Orchids luxuriate under exactly the same conditions as 
Dendrobiums, and if the house is large enough may be placed with them. 
I mean such species as delight in heat if coupled with light and air, the 
last-named conditions being quite as essential as the first. Amongst these 
are the deciduous Calanthes, the Cattleyas named in the last Calendar, 
Coryanthes, Cyrtopodiums, Chysis, and Spathoglottis, also Catasetums, 
_ Mormodes, and.Cycnoches, which should be placed in a light airy position. 
Vanda teres should be grown in full sunlight, if possible, and kept well 
syringed, also. Vanda Hookeriana. While on the stages or in some shady 
place, should such exist, will grow the usual class of East Indian Orchids, 
such as Phalznopses, Saccolabiums, Aérides, Cypripediums, also Angre- 
cums, Pescatoreas, Bolleas, and others. 
» Some of the Oncidiums. also grow well in i as O. carthaginense, O. 
