86 THE ORCHID REVIEW. 
HYBRIDISING DENDROBIUMS. 
Mr. F. H. Moore’s lettter in your February issue (page 52) is very 
interesting, and I am sure that some of your readers would be very glad to 
have him use a little more of the space in your pages that he seemed so 
reluctant to encroach upon. Often I have tried to get seed pods upon my 
Dendrobiums, sometimes aiming for hybrids, and at other times aiming to 
get seedlings of unmixed character, believing, as he suggests, that stronger, 
healthier plants for the greenhouse might be obtained in that way. But I 
have never yet obtained, with my Dendrobiums, more than what he calls a 
“half success,” and I would like to ask him whether, from his experiments, 
he can give any suggestions upon the following points or questions :— 
Does he find any one part of the day a preferable time for making the 
pollinations ? The odour of many Orchid flowers coming and going with 
certain times of the day, must certainly indicate a charge of state in these 
kinds, and probably also the best time for the pollination ; but this guide (?) 
does not show in all flowers. Again, Has he found any difference in the 
success of the pollinations resulting from the kind of day, whether a clear 
and bright day, or one somewhat cloudy? Further, Can he give any 
suggestions as to the amount of pollen to be used? I have thought that 
the pollen from two or three flowers, if applied to the stigma of one, would 
be likely to increase the number of good seeds in the pod. 
If Mr. Moore could also give us some hints as to determining the 
proper age of the pollen and the flower to be fertilised, suggestions that 
would help us to recognise that the flowers are ripe, that, too, would be 
very acceptable. 
Chicago. Py ). Le. Move. 
CALENDAR OF OPERATIONS FOR MARCH. 
By H. A. BURBERRY. 
I'e temperatures for the month should be somewhere near the following 
figures :— ; 
CooL House :—Day, about 60°; night, 50° to 55°. 
INTERMEDIATE House :—Day, about 65°; night, 55° to 60°. 
East Inp1AN House :—Day, about 70°; night, 60° to 65°. 
The temperatures quoted above are for fire heat alone. During sunny 
weather, a rise of the thermometer will necessarily follow, which will in 
all cases be beneficial to the plants, supposing there be but little fire heat 
at the same time. 
_ If the sun should make its appearance suddenly during mid-day, when 
the hot-water pipes are already sufficiently heated to maintain the requisite 
