THE ORCHID REVIEW. 279 
CALENDAR OF OPERATIONS FOR SEPTEMBER. 
By H. A. BURBERRY, King’s Heath, Birmingham. 
THE advent of September reminds us that the summer is rapidly passing 
away, and that the winter is not far ahead. We must, therefore, take steps 
to meet the latter by losing no opportunity of preparing our plants to 
resist the evil influences of the short, cheerless days, and long, cool nights 
which are then inevitable. This can only be accomplished by treatment 
which will tend to harden or ripen the new growth, a process which, for 
obvious reasons, must be gradual in order to be effective. To suddenly 
expose tenderly matured exotic plants to large volumes of air, or to great 
drought, would, of course, be courting disaster. 
We must, therefore, not allow the present month to pass by without 
giving all the air and light that is possible, at the same time gradually 
curtailing the supplies of water, both at the roots and in the atmosphere, 
for there are already a large number of Orchids of various species which 
have finished their growth and require only to have the same properly 
matured. Such plants as Dendrobiums and similar kinds, which make up 
their pseudobulbs quickly, as, for instance, Thunias, Pleiones, Coelogynes, 
Mormodes, Cattleyas, &c., might be removed to another department, such 
as a vinery, and there be treated for the next five or six weeks with 
advantage. But, if no such convenience exists, they must remain in the 
department in which they have grown, and where a good many other 
species are still growing; which latter, although rejoicing at this season in 
more light and air, would not relish guite so much as the vinery would 
afford. Under such circumstances, one must proceed with care, and a way 
out of the difficulty may easily be found by placing those requiring most air 
and light near the roof and against the ventilators, and those liking more 
shade and moisture in correspondingly favoured positions, and all will then 
proceed merrily. 
The Cool house should want no warmth from the hot water pipes during 
this month. Give plenty of air, especially during the night time; in fact, 
let the ventilators be opened wide, and the plants will then make great 
progress. The Intermediate houses, though not requiring it by day, are 
the better for having the pipes gently warmed at night, as it causes a 
quicker circulation of the air, and is therefore a great factor in the 
development and consolidation of the growth. Endeavour to maintain 
a little air on the top ventilators of these houses also during the night, as 
it works wonders at this season of the year. The last instruction should 
also be applied to the East Indian department, as the beneficial effect upon 
the inmates is here no less apparent. 
Any species of cool Odontoglossoms may be repotted with great 
