CULTIVATION. 
383 . 
the higher part of the rockery is best suited for them. 
In such a Fernery as this now before the mind’s eye,, 
convenient positions, in the form of dripping crypts 
and recesses, may be provided for the delicately beau- 
tiful and easily grown Trichomanes and 1 lymenojahyllum, 
without the aid of glass cases that are necessarily 
used, as already explained, under pot-culture. 
Where Tree Ferns would be grown, the proper 
situation for them is the lowest part of the house, in 
the valley, where the greatest head-room would be 
obtained, and most constant shade and moisture about 
their stems, which will encourage the essential growth 
of the aerial out-grown roots. The path in the valley 
may be straight or winding between the Tree Ferns, 
the intervening spaces to consist of raised mounds or 
hillocks, to be planted with the smaller kinds of Tree 
Ferns and other large-fronded Ferns. The different 
species of Selaginella should occupy the intervening* 
spaces between the plants, which will add greatly to 
the natural appearance of the whole and assist in pro- 
moting a genial atmosphere. 
To whatever extent a house of this nature may be 
carried for tropical Ferns, the same must be allowed 
for the extra-tropical kinds, and being sunk, the 
necessary amount of heating power required will be 
just sufficient to keep out frost. Keeping the house 
shut during the winter season, so as to maintain a 
quiet, still atmosphere, greatly assists in repelling 
frost, indeed for such houses ventilation is only 
necessary to keep down high temperature during 
summer; free admission is, however, beneficial when the 
external air is still and moist, when even the tropical 
division may be freely left open during the nights of 
