106 
COMPARATIVE EFFECTS OF EXPOSURE ON TREES- 
foliage at least once a day ; this is particularly necessary, not only to refresh and 
invigorate the plant, but likewise to keep down that troublesome little pest the 
acarus, or red spider. We keep the plants in the frame as long as there is height suffi- 
cient ; but when there is not we remove them to a forcing-house, or pine stove, where 
there is a moist heat of not less than 60 degrees. If they grow properly, they are 
removed into pots one size larger every third week; but perhaps the best criterion is to 
re-pot them as often as the roots protrude through the hole at the bottom of the pot: 
we never give them a pot more than one size larger at a time, until they get into 
No. 4, from which they are removed into their permanent pots No. 1. In raising 
standard plants, it is requisite to divest the plants of all lateral or side shoots as soon 
as they can be perceived, and to encourage only the main leading shoot ; but if we 
want dwarf bushy plants, we cut off the main leader when the plants are about one 
foot high, and train out three or four of the strongest side shoots divergently from 
the centre. After the plants are established in their permanent pots, they are placed 
in the greenhouse or conservatory, where they will send forth their trumpet-like 
flowers in the greatest abundance for several weeks in succession. The above re- 
marks apply more particularly to JB. suaveoletis ; but we are perfectly satisfied that 
they will apply with equal force to B. sanguinea and tricolor. 
REMARKS, 
SHOWING THE COMPARATIVE DIFFERENCE AND DISPOSITIONS OP TREES 
PLANTED IN EXPOSED AND SHELTERED SITUATIONS. 
From that excellent little scientific work, entitled " The Alphabet of Gardening, 
by Mr. James Rennie, Professor of Zoology, King's College, London," we select 
the following hints, hoping they will not altogether prove unacceptable to our readers 
in general ; and we feel assured that, to those whose study and delight is to inquire 
into and investigate the laws of nature, they will be perused with pleasure and profit. 
" The degree of light and of exposure has a great mechanical effect on plants. 
In the interior of forests and crowded orchards, the wind produces much less effect 
than on solitary trees in a garden or park. When crowded, the tops push up into 
the light above, and, not being agitated by the wind, their trunks do not thicken 
or become stunted, to prevent the blast making a greater pull against the roots. 
" On the other hand, when standing in an open situation, trees, being freely ex- 
posed to every storm, give every advantage to its violence, by the wide spreading of 
their branches. 
" In accordance with this, solitary trees become greatly larger than those which 
are crowded, while their system of root is always proportional to the branches, in 
order to afford a heavier ballast and a stronger anchorage for counteracting the 
greater spread of sail displayed in the wide expansion of the branches. The same 
is true of all or most garden plants, which extend in proportion to their room. 
Hence the necessity of wide planting when it is required to have plants with large 
