June, 1918.) THE ORCHID REVIEW. 133 
and may have more liberal supplies of water, with an occasional watering 
of weak manure or soot water. Care must be taken that the liquid manure 
is not too strong, or the water too cold, as I am convinced that many cases 
of spot and disease are attributable to these two things. 
Mitrontas.—There is at the present day so much variety of colour in 
the different species and hybrids of the M. vexillaria group, that a large 
batch of them make a glorious display. When well grown few plants 
produce flowers in such abundance, and they can be enjoyed throughout the 
summer months. Plants which produced their flowers early, will now have 
passed out of bloom, and should be afforded a short rest, by placing. them 
in cooler quarters. No attempt must be made to withhold water at the 
roots, and nothing should now be done to induce premature growth, for the 
longer the period of rest the stronger the growth will be when the season of 
activity commences. Although these plants are never entirely inactive, 
they are some little time recuperating after carrying a heavy crop.of flowers. 
The hybrids, of which M. Bleuana and M. Hyeana are the two best known, 
make their growth in the same way as M. vexillaria, and require similar 
treatment, with the exception of temperature, for they like a slightly higher 
temperature than M. vexillaria at all seasons, a character derived from 
M. Roezlii. There are several other very beautiful hybrids which deserve 
a place in the most select collections. 
EPIDENDRUM PRISMATOCARPUM is a_ pretty species which many 
growers in the north. find some difficulty in growing and flowering 
satisfactorily. This may perhaps be attributable to climatal conditions, but 
in any case it is seldom seen in such good condition in the north as in the 
southern counties. As the plants pass out of bloom, any that require 
additional rooting space should have attention. It thrives in a Cattleya or 
Intermediate house temperature, and enjoys a moderate amount of light and 
air. Aclean fibrous compost answers its requirements. 
ZYGOPETALUM MACKAY! AND Z. CRINITUM, will now be rooting 
freely, and must receive supplies of water whenever the compost becomes 
dry. The warm end of the Intermediate house will suit them at this 
season, and their surroundings should be kept moist. It is also advisable 
to spray them overhead occasionally to prevent attacks of insect pests, 
Zygocolax Veitchii, Colax jugosus, and other similar plants thrive under 
the same co nditions, and all should be shaded from strong sunlight. 
MAspEVALLIAs.—Many of the smaller Masdevallias will be making a 
nice display of their interesting flowers, and must be protected from all 
Strong sunshine. Many of the stronger-growing M. Harryana section are 
also throwing up their flowers, and a cool humid temperature should be 
maintained at all times. A careful watch must be kept for thrip on these 
Plants, as it not only disfigures the foliage but also destroys the flowers. 
