218 THE ORCHID REVIEW. 
Cattleyas grew at Exeter in a house so glazed as to enable him to pass the 
handle of a budding-knife between the lap of each pane of glass. I believe 
many amateurs at that time took the hint, and constructed their roofs on 
a like scale, but found it rather inconvenient in snowy weather, and the 
system generally proved too much for the plants during cold wintry weather, 
especially when the houses were in exposed situations, which I can fully 
understand would be the case. No doubt the climate at Exeter is com- 
paratively warm to some parts of England, and perhaps the house in 
question was somewhat sheltered. However that might be, and although 
it may not be a good system to adopt universally, yet it clearly sets forth 
that which is needful, and the ways and means of procuring. the same must 
necessarily be left very much to the judgment of the cultivator. Further 
remarks upon the subject will be found in the Calendar for January last, 
under the heading of ‘“‘ Air.” There I remarked that cold direct draughts 
should be avoided, which I now qualify by saying that for cool-growing 
Orchids it applies only during severe weather in winter. For these species, 
cool direct draughts during summer are probably more beneficial than 
otherwise. 
Pot up any of the Cypripediums that have finished blooming; these 
delight in new material (see February Calendar), and quickly recover from 
the effects of being shifted. Pleionés should be manured, and be given 
plenty of water. Cow dung is a good thing for there, and also for Thunias ; 
but should this system prove objectionable, it may be applied in the form of 
liquid manure. When the Thunias have done flowering, they should be 
given plenty of air and water for the next two months. Some of the earliest 
of the Dendrobiums will soon be finishing off. When the last leaf of D. 
Wardianum makes its appearance, the plants should be taken to a cooler 
house, as this species is very quick to start a second time, which should be 
avoided if possible. D.chrysanthum may be taken to the Cattleya house, 
and kept moderately dry only. This species will soon push forth its 
flowering buds, and open during the autumn months, usually before it is 
denuded of foliage. 
A correspondent wants advice on his Odontoglossum Alexandre : ‘“ the 
leaves turn yellow and die, and they are going from bad to worse.” The 
bedding-out system is wrong. Plants that grow on the branches of trees 
ought not to be planted in beds on the ground, nor on stages, unless it is for 
a few weeks after being imported to resuscitate. Grow them in pots, and 
Stand the pots on open wood-work stages, so that the air can pass up 
between them. Give an abundance of air both night and day, and water 
during the summer as soon as the moss commences to look white, but 
during winter much less frequently. Do not dip the plants in insecticides 
to destroy thrips, as the plants are also destroyed—use tobacco powder. It 
is the chemical insecticides to which I refer; a liquid extracted from the 
