54 PRESENT-DAY GARDENING 
many town and suburban dwellings. These are heated by 
a small boiler with hot-water pipes, a means, it should be 
said, which is the only satisfactory method of heating 
glass structures. To the species indicated for the smaller 
and less safely heated structures may be added a very 
wide range of subjects of great beauty. In such a structure 
the Palms supplying decorative foliage may be much re- 
stricted, or entirely dispensed with, as Cymbidium Lowi- 
anum, C. giganteum, C. Tracyanum, and any others of 
the section having evergreen leaves of much grace, are 
decorative plants at all seasons, and possess the further 
advantage of being furnished with fine spikes of flowers 
for several months in the year. These large and strong- 
growing species are specially adapted for the conservatory, 
an Orchid house being unnecessary for them. 
To the heated conservatory also may now be handed 
over the showier species and hybrids of the South American 
Cypripediums (Selenipediums), which, probably because of 
their very free-growing nature rendering them too large for 
the Orchid house, and the ready manner in which they 
may be increased, have caused them to be slighted lately 
by growers of collections of Orchids. The air of the con- 
servatory, rather drier than that of the Orchid house, suits 
these plants admirably. Their bright evergreen foliage . 
and tall sprays of white and rose, or greenish flowers tinged 
with purple, which often by succession keep the specimens 
in bloom for six months in the year, render them beautiful 
and interesting subjects for the conservatory. 
The strongest and best kinds to be acquired are 
Selenipedium longifolium, S. Sedenii, S. cardinale, S. 
calurum, S, grande, S. Schrédere, and S. albo-purpureum, 
