FEBRUARY, 1916.] THE ORCHID REVIEW. 45: 
attended to when they are seen to be pushing new roots from their base. 
These plants resent being disturbed at the roots, and should there be room 
for the new bulbs to. develop, and the material is in good condition, the 
potting may be safely deferred, as they bloom more freely when in a pot-, 
bound condition. The species and hybrids of this useful genus, with the. 
exception of C. Humblotii, delight in a cool position in the Intermediate 
house, but must be shaded from the direct rays of the sun. If grown in a 
dry position red spider will attack the leaves, which must be destroyed by 
sponging from time to time with a weak solution of insecticide. A similar 
compost to that used for Cypripediums will answer their requirements.. 
Those that are now pushing up their flower spikes may have attention at a 
later date. They should have water afforded them whenever they become: 
dry. 
Oncip1ums which have flowered, and have now commenced to grow and 
produce roots, may be repotted. These plants resent a sour compost, so if, 
the compost is worn out it is advisable to renew it. A similar compost to. 
that used for Odontoglossums is suitable. As they enjoy plenty of light, 
they are best grown suspended from the roof, and therefore shallow pans. 
are the best receptacles. Most Oncidiums enjoy the temperature of the 
Intermediate house, but such species as O. Papilio, Kramerianum,- 
Lanceanum, and Cavendishianum do best in the Warm house. 
MitTonts of the vexillaria section will, as the days lengthen, take up. 
abundance of water, if the plants are well rooted, as they should be. Such 
varieties as M. v. Leopoldii, superba, and others which produced their 
flowers too late in the autumn to allow of them being potted then, may 
now have that attention if they have made new growth. Many of the 
Brazilian Miltonias, such as M. spectabilis and its variety Moreliana, M. 
Bluntii Lubbersiana, and others which are now developing new roots, will 
also be in need of more compost. In repotting, care must be taken that. 
the young roots are not injured, as they are very tender and are easily 
broken. The same compost as used for Oncidiums is suitable, and at this 
season the plants are best accommodated in the Intermediate house. 
VANDAS AERIDES, and SACCOLABIUMS.—Any plants of these genera, 
when showing signs of renewed root action, may have attention as regards. 
repotting or resurfacing. It is not desirable to repot them unless a shift is 
absolutely necessary, but even in the case of well-rooted healthy specimens 
it is desirable to renew the compost on the surface. after the long season of 
rest. Where top-dressings of this kind are necessary, care must be taken 
that the drainage is satisfactory. I am, however, not much in favour of. 
top-dressings, simply for the reason that it makes the watering of plants so. 
much more difficult, and only practise it in exceptional cases. Plants that. 
have become leggy through loss of their lower leaves should be reduced by: 
