* 
170 THE ORCHID REVIEW. [JuLy, 1916. 
i CALENDAR OF OPERATIONS FOR JULY. 
By J. Ts. Barker, The West Hill Gardens, 
Hessle,’*E: Yorks, 
HE cold, wet, sunless weather experienced since my: last has necessitated 
the use of fire heat to maintain the night temperatures, especially in 
the warmer divisions. The use of so much fire heat at this season. is 
exceptional, but the temperatures must be maintained, or harm will accrue 
through dampness and other causes attributable to a low temperature; and 
at this season, when everything is starting into growth, it is wise to give a 
trifle more heat than otherwise, provided sufficient moisture is maintained 
in the atmosphere. The latter is important, for a too dry atmosphere is as 
harmful as a too moist one; one breeds insect and other pests, the other 
black spot and other diseases. An excess of fire heat, however, should be 
avoided at all seasons. 
TEMPERATURES.—The temperatures, watering, ventilation, and 
atmospheric conditions given. in the May number should be. continued 
through the growing season. It is a difficult matter to give an outline even 
of a general treatment that will be applicable in every case, some localities 
being so different to others as regards the outside conditions, but considering 
that the health of the plants depends entirely on the atmospheric conditions 
of the houses, this matter should have the closest attention. 
CATTLEYAS AND L#&LIOCATTLEYAS.—At the present season many of 
these most beautiful Orchids are in flower, among the former being the 
lovely species C. Mossize, Mendelii, and Warneri in their numerous varieties, 
and among the latter Lc. Canhamiana, Aphrodite, and many others, in 
which Lzlia purpurata is one of the parents. These primary hybrids will 
undoubtedly always claim a place in our collections on account of their 
form, size, and colour. There is great variety among’them, as also in the 
parent species, and if some of the early ones are lost, the crosses can be 
made again and again from selected parents. It should now be possible 
to raise an albino of the lovely Lec. callistoglossa from the pure white 
C. Warscewiczii crossed with L. purpurata alba. 
Plants of the whole of this family, as they pass out of bloom, should be 
afforded a short rest, and the proper time to give new material at the roots, 
should they need it, is as soon as roots are observed to be pushing from the 
base of the pseudobulbs. The method, and the material used in repotting, 
has been given in previous numbers. The whole of this family should be 
potted firmly, especially in the material now obtainable. The late summer 
and autumn-flowering members of the group are now growing freely, and, 
owing to the weather conditions, should be treated liberally and placed in 
positions where they may receive every atom of light and air on all favour- 
