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March 29, 1883. ] JOURNAL OF HORTICULTURE AND COTTAGE GARDENER. 
and no air would be given unless necessitated by strong sunshine. 
To prevent burning, I should shade where blinds are available, or 
give as little air as possible. Neither am I an advocate of fixed 
temperatures, especially high ones, during the night time, believing 
this to be. only an invention to worry the life of the under gardeners. 
We certainly prefer to see the temperatures of the different houses 
near a certain height, but if they happen to be either a trifle higher 
or lower occasionally no notice is taken, because no ill effects 
result. I hold we should ventilate when the external conditions are 
259 
favourable, and, unless “J. J.” admits fresh air to his house judi¬ 
ciously, I am afraid his Orchids will not equal his expectations. 
We are informed by “ C. P. P.” (page 66) that “hot-water pipes 
secure a constant circulation of air,” but much as I respect the 
esteemed writer, I cannot believe he resorts to no other method of 
ventilation. No doubt when the pipes are first heated the radiation 
is rapid and far-reaching, but I feel certain the area thus affected 
gradually lessens according as everything becomes much warmer. 
Besides, if there is no egress for the rarified air this must collect at 
Fig. GG. —Riiodociiiton VOLUBILE. (See page 258.) 
the highest point and stagnation gradually result. The slightest 
opening of the top lights of a house quickly effects a change in the 
atmosphere. This I submit is beneficial, and it is an easy matter 
on a still day to accomplish without lowering the temperature 
one degree.— W. Iggulden. 
Freesxa refracta alba.— I have tried this and F. r. Leitchlini, 
both indoors and planted out, but have not succeeded with them to 
my satisfaction—at least, not so well as some of my correspondents. 
A lady in Sligo (“ M. R. P.”), who has been more fortunate in her pot 
culture for greenhouse decoration, writes to-day—“ On one of my 
plants there are now three flowers open, and about six more to ex¬ 
pand. The form is most elegant and showy, and the perfume a 
delicate Auricula scent.” Would some growers tell us of their 
system of growth ?—W. J. M., Clonmel. 
PELARGONIUMS IN WINTER. 
It is hardly necessary at the present day to apologise for re¬ 
ferring to Pelargoniums as winter-floweriDg plants. Since the 
late Dr. Denny called attention to the beauty of some of his 
seedlings ten or a dozen years ago their cultivation for flower¬ 
ing in winter has increased in a wonderful manner. The point 
of the greatest importance for winter-flowering is the selection 
I 
