DEcEMBER, 1913.] THE ORCHID REVIEW. 367 
elevated near to the glass to receive as much light as possible. The rare 
Z. Ballii, now in flower, requires the same treatment as Z. Mackayi. Z. 
maxillare and Z. m. Gautieri will thrive under the same conditions, but 
succeed best 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 be kept moderately moist at all times. The 
Intermediate house is also the best place to grow such bigeneric hybrids as 
Zygocolax Veitchii and others. They succeed under precisely the same 
conditions as Zygopetalums. Zygopetalum rostratum and Z. Roeblingianum 
should be grown in the warm, moist, plant stove, whilst Z. Burkei requires 
Cool house treatment. The miniature Promenza xanthina, stapelioides, 
and Rollisonii also succeed suspended from the roof of the Cool house. 
CyYPRIPEDIUMS.—The winter-flowering Cypripediums need no words of 
recommendation from me, as their floriferousness, the ease with which they 
can be grown, and the lasting quality and beauty of their flowers are all 
well known. Another great consideration to those who live in large towns, 
or near them, is that they suffer less from fog than almost any other Orchid. 
Cypripediums are always in active growth, hence absolute dryness at the 
roots is injurious. During their flowering season the minimum amount of 
moisture at the roots is required. But whenever the compost becomes dry 
the plants should have water afforded them, care being taken that they 
become fairly dry between each application. A moist atmosphere must be 
maintained always, but care should be taken to prevent a saturated one 
with alow temperature. During their flowering period a night temperature 
from 55° to 60°, with a slight rise during the day, will suffice. 
ODONTOGLOssuMS.—The species and the many hybrids of this genus 
that were potted in September may be afforded more liberal supplies of 
water at the roots, in accordance with their requirements. The new roots 
will by this time have made considerable progress in the new compost, 
hence they will take up more moisture. The usual precautions are 
necessary against the compost becoming in a saturated condition. 
L#LIA ANCEPS will be in flower; also L. albida, autumnalis, and 
Gouldiana, and with the aid of the numerous Cattleya and Leliocattleya 
hybrids it is now possible to make the Cattleya house quite gay at the 
festive season, when their beautiful flowers are much appreciated. When 
these plants pass out of flower, only sufficient water is needed to keep 
the pseudobulbs fresh and plump. The atmosphere should be kept 
moderately moist to prevent attacks of insect pests, and fresh air, according 
to external conditions, should always be afforded them. 
CaTTLEYAS.—Plants of Cattleya Warneri that are now starting into 
growth should be placed well up to the light at the warmest end of the 
house, and until the plants open their flowers water sufficient to keep the 
