316 THE ORCHID REVIEW. 
Writing on protection from cold reminds me of the double glazing 
system which was at one period thought by some to be the secret of success, 
though it has long since been abandoned, owing to the extra pane of glass 
excluding so much light, and thus the remedy was almost as bad as the 
disease. The system, however, has its virtues, and those who have hitherto 
been unsuccessful with Phalznopsis might do worse than try it. 
Masdevallias are better for a temperature averaging 3° to 5° warmer 
than the coolest house from now until spring, and this should be given them 
if possible. They like a moist atmosphere, but should not be kept too wet 
at the root, as overwatering is the chief cause of that familiar black spot. 
The Chimera section, and that pretty little species, M. tovarensis, certainly 
do best in the intermediate houses. There are many other so-called cool 
Orchids that are also better for this extra warmth during winter, such as 
Vanda Kimballiana, Anguloas, Aérides japonicum, Dendrobium infundi- 
bulum, and D. Jamesianum, Maxillaria grandiflora and M. venusta, 
Odontoglossum Londesboroughianum, Oncidium cheirophorum, O. tigrinum, 
and O. unguiculatum, Trichosma suavis and Sophronitis grandiflora. The 
latter, although growing well enough, is apt to get a little later year by 
year. Two species of recent introduction, Lelia crispilabia (Lawrenceana) 
and Lelia Crashleyana [What is this?—Ep.], seem to require similar 
treatment to the last named. 
Cattleya dolosa and C. Walkeriana are best grown in baskets suspended 
in the Mexican house. In a former Calendar I recommended occasional 
syringing overhead in this department, but this must now be discontinued, 
or damping of the spikes may occur. A fresh supply of new tree leaves 
should now be placed under the stages in this, and also in the other depart- 
ments. 
Keep a sharp watch for any signs of the Shot-Borer (see February 
Calendar), which attacks the pseudobulbs of Dendrobiums. This is one of 
its most active months. 
Do not let the plants become exhausted by allowing their flowers to 
remain on too long, as this is a prolific source of deterioration. Vanda 
ceerulea, for instance, suffers greatly. I am inclined to think that the 
departure of this beautiful Orchid is further hastened by keeping it too cold 
in winter. It should then either have the warmest part of the Cattleya 
or Mexican house, or be transferred to a suitable position in the East 
Indian house. 
A correspondent cannot grow Oncidium Lanceanum. ‘“ There are black 
spots on the leaves,’”’ which is due no doubt toa superabundance of moisture. 
It is a warm-house Orchid, but is generally grown in that house regardless 
of position. It should be remembered that it belongs to the stout-leaved 
section, and on that account can endure more drought than most other 
inmates of this house. The lightest and dryest place should be selected for 
