140 THE ORCHID REVIEW. [May, 1903. 
down frequently. Although air cannot be supplied here in such volume as 
in the Cool House yet a little should always be kept on if possible, and no 
favourable opportunity for increasing the amount should be allowed to pass 
by. Inshort, try to keep the above temperatures with as much air as 
possible, always avoiding direct draughts on the plants. No heat from the 
hot water pipes should now be required here, unless it is during the night 
when cold or frost is expected, then a little warmth would be beneficial. 
Several things in this department will require repotting,—such for instance 
as the Odontoglossums of the grande type, some of the Miltonias, Oncidiums, _ 
Cymbidiums, and Lycastes. Trichosma suavis and Maxillarias should also 
be repotted, and other species which may be found to grow best here, 
always bearing in mind how very important it is to do each plant at the 
proper time, which is, as previously remarked, when making new growth 
from the base, and new roots are pushing forth. If done later a good deal 
of unnecessary exhaustion and shrivelling takes place. I would mention 
here how very important it is to experiment one’s self with those plants 
which fail to grow freely from no apparent cause, and not to keep them too 
long in that house or position most generally advised, for different structures 
vary greatly, and certain peculiar conditions in one house may be lacking in 
another. It is therefore advisable to make experiments with refractory 
species, carrying out such experiments with due caution, and treating them 
to different houses, or to different positions in the same house ; either 
warmer or colder ; trying the cooler house or position first, as it is always 
well to know how low a degree of temperature the various plants will stand 
without injury. When this is once known their cultivation is simplified 
very considerably, for it may be taken for granted that if no injury is 
received by sucha temperature the plants are benefited by it. 
CATTLEYA AND Mexican HousEs.—These should be kept at about the 
same temperature as the Intermediate House, of course allowing a higher 
degree by sun heat, as these departments will not require so much shade, 
especially the Mexican House. If any shading is applied here it should be 
= thin indeed ; consequently, a good deal of ventilation is demanded 
during bright sunny weather, to keep the plant from burning, which should 
be avoided. In the last-named house such things as Mormodes, Coelogynes, 
and some of the warm-growing Epidendrums, such as E. Parkinsonianum, 
E. nemorale, E. atropurpureum, and E. prismatocarpum, should, if not 
already repotted, be done without delay. This month will see another 
batch of the Cattleya house plants potted up or top-dressed according t0 
requirements. These will include C. labiata, C. Harrisoniana, C- Loe: 
digesit, C. Schroeder, C. Eldorado, C. Bowringiana, C. Lawrencean@, C. 
kira nio, and any others if it is deemed necessary. Vanda suavis and V. 
insignis have just finished flowering, and will be done up by replacing the old 
