JuNE, 1910.] THE ORCHID REVIEW. 173 
will require attention as the power of the sun varies during the day. A 
slight increase of temperature late in the afternoon may be secured by 
reducing the ventilation, and this is conducive to vigorous growth, but the 
ventilators should be opened again before dark, as high night temperatures 
are injurious. The fires should be kept as low as possible except in dull or 
cold weather. The spikes should not be left on the plants too long, or 
shrivelling may sometimes be noticed. A sharp watch must be kept for 
insect pests, and the usual remedies applied. 
In the Warm house Vanda tricolor and suavis, a few late-flowering 
Dendrobiums, and various Cypripedes will be flowering well, with 
Phalznopsis amabilis and others where such plants are grown. The con- 
ditions applicable to the Intermediate house will apply here except that a 
rather higher temperature should be maintained. A good many plants will 
require potting in this and the Intermediate house, and the right time for 
this operation is just when the young roots are beginning to push. If more 
room is required or if the compost is in bad condition potting is advisable, 
but otherwise a little top-dressing will suffice for the season. Root action 
should be encouraged as much as possible, as on it vigorous growth largely 
depends. 
CALENDAR OF OPERATIONS FOR JUNE. 
By W. C. Price, Oakdene, West Didsbury. 
THE welcome change from dull to brilliant weather has been all that is 
desired for the welfare of the plants, which are already showing their 
appreciation by increased vigour, especially those that occupy the warmer 
departments. They seem to delight in their natural sun-heat, growing and 
flowering so much better than when fire-heat has to be used. The cool- 
growing species will be difficult to keep cool enough, especially if grown in 
a house that is exposed to the sun all day, and only by heavy shading, 
judicious ventilating, and abundance of moisture can this be done. The 
grower will find plenty to interest him in looking over his collection, as 
nearly every day there is something fresh to be noticed, such as a plant 
pushing new roots, and another a young growth or possibly a flower spike 
that has long been expected. 
A word of caution to beginners may not be out of place against the 
practice of allowing the flowers to remain upon the plants too long. It 
is frequently done, greatly to the detriment of the plants, causing them to 
shrivel, and weakening them to such an extent that they are hardly able 
to form a new growth, and often die from exhaustion. Small and weakly 
plants should not be allowed to flower at all. The flower spikes should be 
removed as soon as they appear, and by giving the plants a fair amount of 
rest after flowering, and afterwards gradually starting them into perv 
