APRIL, 1914.] THE ORCHID ‘REVIEW. III 
times. Cleanliness is a most important factor, and thrip must be 
rigorously excluded, or little or no progress will be made. Our object 
should be to keep them growing from the time of germination until the 
flowering stage is reached. If at any time fungi or lichenous growth 
attack the seed pans or store pots, the seedlings ought to be removed into 
fresh soil at once, irrespective of season or growth. Most collections are 
troubled more or less with the small ‘“‘ moss”’ fly, and there seems to be no 
way of eradicating this nuisance. It is introduced with the potting 
material, and if they are at all numerous the compost becomes a sour mass 
in which no Orchids will thrive. A good planis to spray over the seedlings 
before vaporising the house, or to vaporise immediately after the usual 
watering is done. An occasional spraying with a weak solution of XL All 
liquid insecticide or the new phytophiline is also beneficial. 
SOPHRONITIS GRANDIFLORA.—This brilliant little Orchid may be 
repotted or top-dressed when new roots are seen at the base of the partly- 
developed growths. Large receptacles are not required, and only a small 
quantity of soil is needed. Suspend them from the roof either in the Cool 
or Intermediate house. 
DENDROBIUMS.—In some establishments there is a Dendrobium house, 
but this is not really necessary where other warm Orchids are cultivated, 
or an ordinary plant stove exists. They need ample heat and moisture 
while growing, but directly they have completed their season’s growth a 
cooler and drier house must be chosen, or an early vinery is. an ideal spot, 
if such accommodation can be procured. During the present month some 
of the nobile section will require attention at the root. Any that are in 
need of it must be repotted in a mixture of osmunda fibre, AI fibre, and 
fresh sphagnum moss. After being disturbed at the base, water must be 
applied discreetly, or many of the new shoots will damp off, but when the 
roots reach the edge of the pots or pans they ought to be liberally supplied 
until the pseudobulbs are fully developed. Throughout the growing period 
they should receive as much light as possible short of scorching the foliage. 
The number of hours that a thin shading will be needed largely depends 
upon the position of the structure. A close, stuffy atmosphere must be 
avoided, and when the external air is above 40° F. the bottom ventilators 
may be open an inch or so both day and night. When the weather is hot 
a light spraying overhead and an: occasional syringing between the pots 
may be practised with beneficial results. 
Tuuntas.—As these plants start into growth, they should be overhauled 
and afforded fresh rooting material. The whole of the soil is shaken away, 
the dead roots cut off, and the plants repotted in a mixture of sphagnum 
moss, fibrous loam, and one of the well-known fibres. The stems may 
either be potted separately or three or four in a receptacle, but each stem 
