136 
THE GARDENER’S MONTHLY. 
May, 
This is one of the chief reasons of the su¬ 
periority of the system of water pipes for heating 
plant houses—the easy means it affords of distri¬ 
buting heat evenly and at a low temperature 
through a large amount of piping ; and in this 
low temperature of the radiating surface, lies the 
secret of the relative quality of water, steam and 
fire heat. If it were possible to heat the same 
amount of radiating surface, at the same low 
temperature, with fire heat, the purity of tfyp; 
atmosphere, would be retained in an equal de-^ 
gree as with water ; on the other hand if water 
was circulated under the same pressure as steam, 
the evil effects would be precisely the same. 
Reference is made to the great quantity of water 
to be heated in a water apparatus as compared 
with steam—but the heating of the larger quan¬ 
tity does not involve a loss of fuel, because all 
the heat received by the water is transmitted to 
the atmosphere of the house, through the pipes 
as the water cools; and the heat contained or 
stored in the large volume of water, maintains a 
greater permanency in the temperature of the 
house with less frequent firing. When the ap¬ 
paratus is of proportion and power, a fire ot 
^thracite coal may be safely left, without at¬ 
tention from " b ^ours during severe 
sufficient for moderate weather only, and suffers 
in consequence. 
SPRAYING PLANTS. 
BY DR. WM. F. CHANGING, PROVIDENCE, R. I. 
An instriunQnt comes to us from France this 
year for sprayin^plant s on the large scale. It 
consists &f- a ‘common pair of bellows, to 
the r /ozzle fo>f wfrfch\is screwed an “atomizing’’ ^ 
appapwfl^l^simirap\in principle to the little ^ 
atomh^r^PoTpjnQpikr sold by druggists for va- 1 ^ 
porizmg perfi^y^j and figured also in the 
catal\feuesE^f /feqip J florists for spraying plants. ** 
This foparatus4qyihe French instrument con- ^ 
sists oPQrt^erical metallic receptacle for water y -i 
or other ttmda* and two tubes meeting each other 
at nearly right angles, one of them being screwed jpf 
into the bellows and conveying the air blast, and _ * 
the other dipping into the water receptacle. 
This receptacle, however, is not rigidly attached, V 
but hung to the air-tube so as to swing freely ^ v 
and allow considerable motion of the bellows, 
without spilling the water. The water tube is - ? 
made of rubber where it dips into the receptacle J 
to accommodate itself to the swinging motions of 
the latter. 
The instrument is well made and will vaporize 
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