Juty-Aucust, 1918.] THE ORCHID REVIEW. 157 
moss, with a slight addition of broken leaves. The ar fibre makes the 
compost more durable, and prevents the peat fibre from decaying so rapidly 
and becoming a decomposed mass. It is false economy to neglect the 
repotting of any Orchid whenever it needs it, as if a plant is not worth 
repotting it is not worth keeping. The newly-potted plants should be 
cleaned and placed by themselves, where their individual requirements can be 
treated and studied, especially in regard to watering, shading, and spraying. 
WATERING.—In most cases, the failure to grow these plants satisfac- 
torily is attributable to too much water at the roots, and to the atmosphere 
being kept continually in a saturated condition. Nothing is more conducive 
to healthy growth than allowing the atmosphere to become comparatively 
dry for an hour or two each day. 
Cocuiopas and their hybrids succeed under similar conditions and in 
the same material as Odontoglossums. There are now so many fine hybrids 
which have been raised from Cochlioda crossed with the species and hybrids 
of Odontoglossum that the greatest difficulty is to trace their ancestry. In 
a family so large and varied, individual plants will vary slightly in constitu- 
tion and vigour, but close observation will soon teach one their requirments, 
and as none are especially difficult to cultivate, they may be taken in hand 
by anyone. They supply a colour which is not obtainable from any other 
source, and we may safely assume they will enjoy extensive culture in the 
future. 
MILTONIA VEXILLARIA.—Plants of this species, and of the hybrids which 
produced their flowers early in the season, are now commencing to grow: 
actively, and those that require fresh rooting material may have attention as 
they reach the desired condition. The later part of July and the beginning 
of August is the best time of the year to repot or disturb the early summer- 
blooming varieties. With the aid of the late summer-blooming forms and 
the autumn-blooming ones it is possible to maintain a display of their 
beautiful flowers for fully six months of the year. The repotting of the late- 
flowering varieties is-best deferred to a later period, but as they succeed in 
the same material and under the same conditions, their culture is similar, 
except that, being later in making their growth, they require attention 
accordingly. Being surface rooters, they are best grown in half-pots or 
deep pans, and will succeed in a similar compost to that used for Odonto- 
glossums. Water must be sparingly applied to the newly-potted plants 
until the new roots freely enter the new material. A moist position 1n the 
Intermediate house, where they can be shaded from strong sunshine, 
answers their requirements at this season. Unsuitable atmospheric 
conditions must be avoided. Too much heat will result in an attack of 
thrip and other insect pests, and the young growth will damp and fall off 
'n too cold and damp a situation. 
