422 
LANDSCAPE GARDENING. 
diameter from an open boiler, and by Perkins’ mode, as it is 
called, which employs small pipes of an inch in diameter, 
hermetrically sealed. Economy of fuel and in the time re- 
quisite in attendance, are the chief merits of the hot water 
systems, which however have the great additional advantage 
of affording a more moist and genial temperature. 
In a green-house, the flues, or hot water pipes, may be con- 
cealed under the stage. In conservatories they should by all 
means be placed out of sight also. To effect this, they are 
generally conducted into a narrow, hollow chamber, under 
the walk, which has perforated sides or a grated top, to per- 
mit the escape of heated air.* 
One of the most beautiful conservatories attached to the 
dwelling, to which we can refer our readers, for an example, 
is one built by J. W. Perry, Esq., Brooklyn, near New-York, 
(Fig. 78,) forming the left wing of this elegant villa. Among 
* The circulation of warm air is greatly accelerated, when an opening through 
the outer air is permitted to enter the hot air passage, thus becoming heated and 
passing into the conservatory. 
