JULY, 1912.] THE ORCHID REVIEW. 213 
-whenever the weather and outside conditions are favourable, and the house 
amay be closed and the blinds drawn up about an hour before the sun ceases 
‘to shine on the roof. A moist humid atmosphere must be maintained at 
all times during the growing season, but overhead spraying or syringing is 
not to be recommended, as, if done injudiciously, much harm can accrue. 
PALUMBINA CANDIDA grows and blooms freely when suspended in shallow 
‘pans in the Intermediate house. 
MASDEVALLIA TOVARENSIS.—This pure white Masdevallia, with the 
others which were potted in the spring, will now have recovered from their 
‘disturbance, and be making new leaves. They may have water afforded 
them whenever they become dry, but care should be taken that they 
‘become so between each application. A moderately shady position answers 
‘their requirements much better than a more exposed one, and plants grow 
stronger in the former than the latter position. 
OponToGLossuMs.—O. grande, O. Insleayi, and O. Schlieperianum are 
-all easy Orchids to grow, and require a temperature a little above the Cool 
house, and are best accommodated in a cool Intermediate house. They 
are a little irregular in their blooming season, especially the two latter, but 
if the plants are healthy and strong they are usually at their best about this 
season, and the blossoms, if kept dry, remain in perfection for a consider- 
able time, and no harm will accrue by allowing the flowers to remain on 
‘tthe plants. The young growths are produced early in summer, according 
to the different species, but new roots are not produced until the growths 
have become a considerable size, and have begun to form pseudobulbs. 
‘The older roots being active, the plants may, if necessary, be repotted when 
the young growths are a few inches high. When repotting is necessary, it 
-should be done thoroughly, all the old sour material being carefully removed 
from the roots, and the plants replaced in a compost as previously advised 
‘for other Odontoglossums. As these Odontoglossums have thick fleshy 
iroots, the compost should be used in a rough condition, and not pressed too 
‘firmly. Like all other newly-potted plants, water must be supplied carefully 
‘for some time, and none must be allowed to lodge in the young growths, or 
‘they may damp off. During active growth they appreciate a liberal supply 
.of water right up to the time when they have completed their pseudobulbs, 
-and then sufficient must be given them to prevent shrivelling. These 
-Odontoglossums delight in a light position with a free circulation of air at 
_all times, but must be shaded from strong sunshine. Insects are very fond 
_of them, especially woodlice and small snails, also the different species of 
-scale, therefore preventive measures must be taken. 
QO. ciTrosMuM will succeed under the same conditions as those 
previously mentioned, except that this is best grown suspended, and the 
thers succeed best grown in pots on the stage, All the species of this 
