JuLy, 1915.] THE ORCHID REVIEW. 211 
heat is extra powerful during the middle of the day, it is advisable to well. 
damp the mats whenever they become dry; by this practice the inside 
temperature may be kept 6° or 7° lower than the outside. Odonto- 
glossums, when exposed to strong sunlight admitted through the lattice 
wood blinds, often become red in the leaf, and the foliage does not last 
nearly so long as if it maintained a fresh green appearance. It is not 
always that these red-tinted leaves fall off during the summer months, but 
a great number of them do during the autumn and winter, when fire-heat 
becomes a necessity. 
CypRIPEDIUMS.—Such dwarf-growing species as C. bellatulum, concolor, 
niveum, Godefroye, and several of their hybrids, which have just passed 
the flowering stage, may be repotted if they require it, not disturbing them 
unnecessarily at the roots. The work needs the utmost care, the roots 
being very brittle, and are often injured during the process. Previous to 
repotting it is advisable to allow each plant to become rather dry. 
Thriving specimens that require more space should have the old pot care- 
fully broken, the stale and loose materials carefully removed, leaving the 
drainage untouched if surrounded with living roots. Place the plants into 
a larger pot, filling up rather more than half its depth with drainage 
materials. For this purpose I have experimented with limestone, hard 
chalk, broken bricks, charcoal, pieces of tufa rock, &c., but I have found 
nothing more suitable than clean broken crocks, and for a compost, good 
fibrous loam, freely intermixed with small crocks. In potting, keep the 
base of the leaves about on a level with the rim of the pot, and the surface 
of the compost about half an inch below, which will render watering an easy 
matter. It is advisable to pack the compost quite firmly around the base 
of the plants. Shallow pans are suitable receptacles for these plants, and, 
with copper wire handles attached, are easily suspended within a foot or 
eighteen inches of the roof glass. Cultivate these plants in a light 
position in the Cattleya house, and they should be well supplied with water 
all through the growing season, but the grower should remember to keep 
them well on the dry side during the winter months. Thrips quickly 
damage the young foliage, and should be frequently sought after, but where 
the house is periodically vaporised there will be little need to do this, but 
the leaves may be sponged over occasionally. In so doing much care must 
be taken not to raise the succulent leaves above their own level, or the mid 
rib will crack and the leaf become permanently injured. 
CaTaseTuMs.—Catasetums, Cycnoches, Mormodes, and Cyrtopodiums 
are now growing vigorously, and well-rooted plants need plentiful supplies 
of water, but such plants that are not yet well established need watering 
with great care. When in full growth these plants delight in abundance of 
root moisture, but they should not be kept in a saturated condition for any 
