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3 
1875. THE GARDENER’S MONTHLY. 135 
One advantage which American house gar¬ 
deners have over our English friends is that they 
can plant so many of their pot plants out in the 
open air in summer. Indeed not only window 
plants but large numbers of greenhouse plants 
can be treated in the same way ; of course some 
care has to be taken in the fall, when they have 
to be put into pots again, but this is no great 
difficulty. As for unhealthy pot or tub plants, 
such for instance as gardenias, oran^ 
lemons, oleanders, pittosporums, 
azaleas, or any thing of this class, t! 
better way of treating them medicinally than 
to cut them back severely, and plant out 
into rich garden soil. It is always best in these 
cases to leave some green leaves and young twigs. 
If cut down to old bare stems, once in a while, 
they will not break again. 
COMMUNICATIONS. 
HOT WATER AND STEAM. 
BY CHAS. F. HITCHINGS, NEW YORK CITY. 
JF 
steam, it would of course flow into a greater 
length of pipe, but increased pressure diminishes 
the volume and requires more fuel. Again the 
steam boiler that is capable of furnishing ten 
times more heat than the hot water boiler, must 
be something more than ten times its size and 
will consume more than ten times the quantity 
of fuel. 
It is true that more heat can be obtained from 
pipes heated by steam under pressure, than 
from the same amount of pipe heated by water 
Often to the atmosphere, but not ten times, as 
stated. Take for example, water pipes at an 
average of 190 degrees, which is a fair working 
heat for cold weathef, compared with steam at 
241 degrees, which is equivalent to a pressure 
of ten pounds to the square inch, and say 45 de¬ 
grees as heat required in the greenhouse, and 
it will be found that seventy-four feet of pipe 
heated by steam, will have the same heating 
power as one hundred feet of pipe heated by 
water; and the saving in first cost would be 
in this proportion, were it not for the facts, that 
pipe does not admit of 
? r, that there are many 
r the safe use and proper 
^ e no* t^eded Wth water^ 
merht iron. 
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