Greenhouse— continued. 
ing plants, each subject may be much better provided with 
its special requirements, than when space for cultivation is 
limited to the Greenhouse only. Here a certain tempera- 
ture is maintained which suits a number of plants in flower, 
but may not be warm enough for others that are making 
their annual growth. If one house can be devoted more 
especially to the exhibition of those plants in flower and 
others with ornamental foliage, and they are changed as 
becomes requisite, the interest in Greenhouse subjects will 
be rendered more certain. This is, however, frequently 
impracticable. 
Shape and Aspect. Plenty of light and air being essential 
conditions for keeping in view in the construction of a 
Greenhouse, it follows that the site chosen should be an 
open one. The best shape is a span roof, as light is 
admitted on all sides, and the plants are not so likely to 
draw or grow in any one direction. Fig. 148 represents a 
section of a span-roofed house well adapted for Greenhouse 
Greenhouse—continued. 
tt le H al l H H EF 
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Fic. 150. HIP-ROOFED GREENHOUSE. 
well adapted for amateurs or others with only a limited _ 
quantity of plants, is shown in Fig. 149. This might be 
sufficiently heated by a very small hot water apparatus. 
Hip-roofed honses (see Fig. 150) usually admit 
. light, but are not so convenient for attending 
and arranging the occupants as the full span. 
Again, shelf stages are not so favourable to 
good cultivation as flat ones, where a moist 
bottom of ashes or small stones may be secured, 
on which to stand the pots. Ventilation in. 
hip-roofed houses must be obtained by sliding or 
other movable sashes at the apex, and by small 
doors inserted in the front wall. ‘The aspect 
best suited is one nearly south; but, with the 
full span, the ends should run north and south, 
so that all possible light may be admitted, and — 
in the middle of the day. — 
Greenhouse plants are divided into two 
Fig. 148. SECTION OF SPAN-ROOF PLANT HOUSE. 
plants. A centre stage is shown that may be made flat 
if desired, for accommodating vigorous-growing subjects. 
The side stages are on a level with the walls, and upright 
sashes above these (a, a) are hung so as to open in the way 
indicated. Top ventilation must also be provided, either 
by sliding sashes, as shown in Fig. 149 (which, however, 
have the disadvantage of admitting rain if open), or by a 
more modern method which prevents this, by raising a 
portion of the roof with a lever. A small lean-to house, 
CTA 
i a 
Fig. 149. LEAN-To HOUSE. 
general groups, hard-wooded and soft-wooded. _ 
Hard-wooded Section. This includes all 
plants of a shrubby habit, and the majority — 
of climbers. A large proportion of them are 
difficult to cultivate, particularly if their requirements 
are insufficiently understood, and suitable positions are 
not provided. The majority flower in spring and summer, — 
and proper treatment varies a ing to the condition 
of the plants in such as the growing, resting, and 
flowering periods. Healthy and floriferous hard-wooded 
plants in spring, notably the numerous and beautiful 
species from Australia and the Cape, are only secured 
by constant attention throughout the preceding summer 
and winter. Nearly all repotting should be 
attended to just after the annnal growth 
begins, this season varying with different spe- 
cies. A somewhat closer atmosphere, and 
more moisture, may be allowed for a month 
afterwards, to enconrage the emission of roots 
into the new soil. Afterwards, more air may 
be gradually admitted, and, in bright summer 
weather, a thin, temporary shading applied. 
The aim, with hard-wooded plants, should be 
extent, and to insure its thorough ripening 
in autumn. Without this, the results subse- 
quently obtained in the production of flowers 
will be but secondary compared with what 
is possible under good cultivation. There 
are also numerous evergreen shrubs and 
the sun’s rays in summer somewhat obstructed — es 
to encourage summer growth to the fullest 
