THE ORCHID REVIEW. 121 
In houses where a considerable number of species are cultivated, there 
are always some plants that do not like tobacco smoke, and these it is 
advisable to take out while the operation is being done. Before returning 
the plants to their proper places, see that they are perfectly clean in every 
respect. The following genera suffer more from fumigation than other 
Orchids :—Calanthe, Bollea, Phaius, Platyclinis, Ceelogyne, Aganisia, Onci- 
dium, Houlletia, and Miltonia, also Odontoglossum citrosmum. Thrips 
are yery fond of the young growths, and flower spikes of Odontoglossums, 
Masdevallias, etc., and make sad havoc with them. W ith these cool-growing 
species fumigation is easily overdone, and much damage caused. Therefore 
the safest method of keeping these insects in check is frequent sponging and 
dipping. 
By this time many of the Dendrobiums will have passed their flowering 
period, and will be starting to grow freely. Such varieties as D. nobile and 
its allies, D. x Ainsworthii, D. fimbriatum, and D. Dalhousieanum, do 
thoroughly well in pots, while D. Wardianum, D. crassinode, D. primulinum, 
D. Boxallii, D. Devonianum, D. tortile, D. Findlayanum, D. superbum, and 
its beautiful variety Burkei, succeed best in small shallow hanging pans, 
with perforations round the sides, through which the air circulates and helps 
to keep the roots in a healthy condition. I use these pans generally for 
Dendrobiums, in preference to the ordinary teak basket, as the plants are 
more easily managed when they require more root room. Baskets are very 
liable to decay, thereby injuring the roots, and when more root room 1s 
required, it is exceedingly difficult to remove them without doing serious 
injury to the living roots, owing to the tenacity with which they cling to the 
wood. Those plants that require a shift should be attended to at once. 
In re-potting established plants, do not remove more of the old material 
than is really necessary, as Dendrobiums do not like their roots to be disturbed. 
Carefully break the old pot, taking away as much of it as possible, and if 
the drainage be well filled with roots, do not disturb it, but place the whole 
together into a size larger pot, filling up with clean broken crocks to within 
an inch of the rim. Generally, peat and moss has been the material recom- 
mended for this class of plants to root in, but after several years’ experience 
Ihave found that they make larger bulbs, and also roots, and bloom more 
freely, when grown in living sphagnum moss mixed with broken crocks, 
which should be pressed into the pots firmly. I confidently recommend all 
Orchid growers to adopt this method and give it a fair trial. 
All newly imported plants of Dendrobium should at first be placed in 
‘rocks only, and kept in a cool dry house until the young growths appear. 
Roots will immediately follow, when the plants should be potted, as above 
advised, and placed in their growing quarters. Over-potting must be care- 
fully guarded against, for if the roots get ‘nto a mass of sodden compost, 
they speedily decay, and the young growths are stopped prematurely, soon 
