Nov.-Dec.,, 1919.1 THE ORCHID REVIEW. 193. 
their thick fleshy roots resent a sour compost, it may be advisable when 
flowering is over to repot any that require newrooting material. A suitable 
compost is that advised for the green-leaved Cypripediums. 7Z. Mackayi» 
crinitum, Clayi, and several others grow well in a warm shady corner of the 
warm Intermediate house, elevated near to the glass to receive as much 
light as possible at this season of the year. The rare Z. Ballii, now in 
flower, requires the same treatment as Z. Mackayi. Z. maxillare and its 
variety Gautieri succeed best when grown on the pieces of tree fern on 
which they are usually imported. They are now at rest, and should be 
suspended from the roof of the same house, and kept moderately moist at 
all times. Zygocolax Veitchii and others thrive under the same conditions. 
Zygopetalum rostratum and Z. Roeblingianum should be grown in the 
warm, moist, plant stove, whilst Z. Burkei requires Cool house treatment. 
The miniature Promenea xanthina, stapelioides, and Rollissonii alse 
succeed suspended from the roof of the Cool house. Bollea, Pescatorea, 
and Warscewiczella, sometimes included in Zygopetalum, are Intermediate 
house Orchids which are too seldom seen in good condition in modern 
collections. Having no pseudobulbs, and being seldom inactive, they require 
very careful treatment, and should never be allowed to become quite dry. 
Bollea ccerulea and Pescatorea Klabochorum are two of the finest species. 
DENDROBIUMS are now resting, and should not be unduly excited until - 
the days begin to lengthen and the sun gains power. No good purpose can 
be served by trying to force them into flower in mid-winter. For the cool 
resting kinds, guard against the possibility of the temperature becoming too 
low, for if this happens the plants, although showing no signs of injury at 
the time, are greatly weakened, and often collapse during the following 
season. From 56° to 60° F. is a suitable temperature to aim at, with very 
little atmospheric moisture. As soon as flower buds are seen, they should 
be given slight encouragement, so that they gradually grow and expand. 
GENERAL REMARKS.—Advantage should be taken of this comparatively 
quiet period to facilitate the work for next year. Stocks of potting 
materials should be got in, and prepared ready for use as far as possible, so 
that the work of potting may be carried out expeditiously when the busy 
season arrives. There are also arrears of various kinds to make up, and 
these should be taken in hand as time and opportunities present them- 
selves. We have passed through a period of unexampled difficulty during 
the last five years, but may now hope for a gradual return to normal. 
conditions, when our collections should be able to regain their old 
brilliance. In concluding the Calendar for the year, I should like to 
congratulate the Editor on his success in keeping the Review alive and 
maintaining its interest during such a trying period. May he reap the: 
reward of his zeal and energy in a prosperous future. 
