JuLy, 1923.] THE ORCHID REVIEW. 219 
Ordinary flower-pots are suitable, filled to half their depth with drainage 
material, as during their growing season liberal supplies of water at the 
roots will be needed. Previous to repotting the plants cut away any useless 
back pseudo-bulbs, retaining only two or three behind the lead. Those cut 
off may be utilised for propagating purposes. The plants should be given 
a position near the roof glass in a high temperature and moist atmosphere. 
A suitable rooting medium for all the above-mentioned Epidendrums is- 
Osmunda-fibre, broken up rather roughly, and a small portion of sphagnum- 
moss. 
TuuniAs.—Although the flowers of Thunias do not last long after their 
full expansion they are, nevertheless, very attractive, the fresh green foliage 
and fine arching flower-spikes showing to excellent advantage. As the plants 
pass their flowering stage they should be removed to a cool, well ventilated 
greenhouse, where the temperature does not fall below 55°. The stems and 
leaves should be exposed gradually to the full sunlight, where they will finish 
up and consolidate their growths. When so treated the plants are subject 
to attacks of red spider. To prevent this they should be placed on their 
sides and syringed at intervals with a suitable insecticide, allowing sufficient 
time for the leaves to become dry before syringing the plants again with 
clear water. Water should still be afforded at the roots each time the soil 
becomes dry, and so long as the leaves remain green, but when they 
commence to change colour the supply should be gradually withheld. Any 
plants that have failed to produce flowers, and the stems are growing to an 
unreasonable length, should have the points of the shoots pulled out ard 
the plants subjected to the same treatment as those that have bloomed. If 
it is desired to increase the stock, they may be readily propagated during 
this month by taking off the old back stems nearly down to the base, and 
cutting them off to the joints in lengths of about four inches, and inserting 
them as cuttings in small well-drained pots, using a mixture of chopped 
sphagnum-moss and silver sand. If the cuttings are placed in a frame in a 
warm house they will soon develop roots and top growth, when they may 
be potted singly in a rich compost. When growth is completed these plants 
should be rested in a similar manner to that adopted for the older plants. 
Catrieyas.—Plants of C. Gaskelliana, C. labiata, together with C. 
Bowringiana, and their many hybrids that make new growth during the 
summer months, and which flower during the autumn, are making con- 
siderable progress. It is advisable at this season to keep them elevated well 
up to the roof glass in order to consolidate their growths. Water should be 
afforded rather liberally, but as soon as the pseudo-bulbs are matured the 
water supply at the roots should be considerably reduced, for if these 
autumn-flowering Cattleyas are overwatered at this period it frequently 
causes the new pseudo-bulbs and roots to decay. Seedling Cattleyas and 
