278 THE ORCHID REVIEW. 
CATTLEYA WARSCEWICZII VARIEGATA. 
In a group of Orchids exhibited by G. Marshall, Esq., Claremont 
House, Grimsby, at the Royal Horticultural Society’s meeting on July oth, 
was a peculiar form of Cattleya Warscewiczii, in which the sepals and 
petals were variegated with irregular streaks and blotches of rosy-purple on 
a lighter ground, somewhat after the fashion of C. Mossiz Hardyana, the lip 
being about normal. The peculiarity is likely to be permanent, as in other 
similar cases, hence the above name. We do not remember to have seen the 
variety before. 
ARTIFICIAL HEAT DURING SUMMER. 
With respect to the question raised by one of your correspondents, at 
page 250, as to how far artificial heat may be dispensed with during very 
warm weather, experience has taught me that there are very few days in 
the year, in our Lancashire climate, when it would be safe to do without 
the assistance of the boiler to maintain the required temperatures in the 
houses where tropical Orchids are grown. The only Orchids which do not 
require the help of hot water during the summer months are the Odonto- 
glossums, and possibly the Masdevallias, and a few others which come from 
considerable elevations above sea-level. 
O. O. WRIGLEY. 
Bridge Hall, Bury. 
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CALENDAR OF OPERATIONS FOR SEPTEMBER. 
By H. A. BURBERRY, Highbury, Moor Green, Birmingham. 
THE temperature in all departments should now be allowed a fall of a few 
degrees. The thermometer in the East Indian house, where there are still 
many plants in active growth, such as Dendrobiums, Phalenopses, &c., 
should now range between 75° to 85° in sunny weather ; between 70° to 75° 
in dull weather; and during nights and mornings between 65° to 70°. 
These figures are merely a guide; should it be very warm, thus admitting 
of free ventilation, the above temperatures may be considerably increased. 
I am pleased to read in last month’s Review the remarks on the use of 
fire-heat, by ‘‘ Orchid Grower.” To be thoroughly successful with Orchids 
it is of great importance to carefully watch and regulate the heating 
apparatus. In growing Warm house Orchids fire-heat is our first assistant, 
and it is indispensable during most of the summer, as well as in winter. 
True, there are many days during the summer when it is not required, 
because the solar heat is a better substitute. The nights, however, are few 
when it is not better to have a slight warmth in the pipes, and only during 
a spell of hot weather can it be dispensed with without evil results probably 
