276 THE ORCHID REVIEW. (SEPTEMBER, IgI2. 
advisable to dispense with the top ventilators during the day-time, and 
bring them into use during the night. Any excess of water to the newly- 
potted plants must be strictly guarded against, but a greater degree of 
humidity in the atmosphere may be maintained to prevent the compos 
becoming over dry. 
PLEIONES.—Plants which have now completed their growth for the 
season, may be exposed to more light and air as the leaves turn yellow. The 
water supply must also be considerably reduced, the compost being only 
kept moist, to encourage the flowering growths. P. humilis being still in 
full growth must have water afforded it, whenever it becomes dry. 
OncipivMs that are pushing up their flower spikes should be placed in 
a light position, where they may receive a fair amount of air. O. ornithor- 
rhynchum, and others, which have been growing in the Cool house, will be. 
better taken into the Intermediate house for the winter months. Such 
species as O. Forbesii, O. varicosum, and other Brazilian species, as their 
flower spikes become long enough, should be neatly tied up to stakes, and 
be carefully watched for slugs, which are very fond of the young tender 
spikes. After flowering they should be rested, as these plants delight in a 
long, decided rest, but should not be allowed to shrivel. 
MASDEVALLIAS.— We have now reached the season of the year, when 
members of this interesting genus will need attention. Such species as 
M. ignea, M. Harryana, M. Lindenii, M. Veitchii, and many others which 
have passed out of bloom, should they require new rooting material, are best 
potted at this season of the year. Fora compost I use the following: One 
part each of osmunda fibre, peat fibre, polypodium fibre, and sphagnum 
moss, mixed well together. The strong growers may have a small quantity 
of loam fibre, from which all the earthy particles have been removed, mixed 
with the compost. The compost should be made moderately firm, and the 
base of the plant should be kept on a level with the rim of the pot. Care 
must be taken that the pots are not too large. As Masdevallias require an 
abundant supply of root moisture when in full growth, the drainage must 
be perfect. M. Chimera, and the different species which make up this 
section, with M. tovarensis and others which flower during the winter 
months, should have the potting delayed until February, when they will be 
pushing new roots, and are therefore in a fit condition for the operation. 
The black spots so frequently seen on the foliage of these plants are attribut- 
able to an excessive supply of moisture in the atmosphere, and at the roots, 
and a lowcold temperature. Yellow thrip is the pest which attacks these 
plants, and if allowed a foothold will also soon disfigure the foliage. 
HABENARIAS.—H. carnea and H. Suzanne, as they pass out of bloom, 
should be given a complete rest, and being deciduous they require no water 
after the growth has died down. It is a mistake, however, to hasten this. 
