190 
THE FLORIST. 
i 
engines, pots, vases, philosophical instruments, &c., will he exhibited 
(so we hear) largely, and will give country gentlemen and their 
gardeners an opportunity of comparing the merits (so far as an inspec¬ 
tion will allow) of the different articles shown in each class. We beg 
to remind all parties interested in gardening that this is an opportunity 
which may not soon occur again for inspecting the various forms of 
houses, conservatories, pits, tents, garden machines, and implements; 
and as this manufacturers’ exhibition will remain open a fortnight, a 
visit during that period will amply repay those interested in the 
improvements made during the last few years. We hope the society 
will allow trials to be made where practicable, and that in time the 
different modes of heating and ventilating will be tested at the gardens. 
The head superintendent, Mr. M‘Ewen, is driving on as much as 
possible with his improvements. We have before intimated that too 
much must not be expected, as in a place of the magnitude of Chiswick 
it will be a work of time, but the alteration to the American garden is 
fast approaching completion; when we consider the work connected 
with getting up the exhibition, we are somewhat surprised to find so 
much done already. 
Abies Kcemp/eri .—A young tree of this beautiful Conifer was planted 
out during the first days of April, growth having then commenced. 
We are pleased to say that it has not suffered in the least from the frosts 
which have occurred since; the young shoots are fresh and green, 
and making way. In this neighbourhood the common Larch (nursery 
stuff) suffered by the frosts of the last week in April, injuring the 
spring growth. We may therefore hope the Golden Pine is perfectly 
safe from these visitations. 
An interesting fact—known before, but never much attended to— 
has lately been proved at the gardens of the Horticultural Society, by 
taking the temperature at different altitudes from the surface of the 
ground to 30 feet above it. By consulting the table which records the 
temperature every 6 feet in height, we find an average difference of 
] to ’2P increase of temperature between 6 feet in height and 30 ft. 
—the highest point at which the observations are taken. If we apply 
this to the culture of orchard fruits, we perceive the advantage full 
standard trees have of escaping spring frosts to dwarfs, &c.; the differ¬ 
ence indicated in the table between the amount of cold at 0 feet eleva¬ 
tion and 30 feet being sufficient, although small, to preserve the bloom 
uninjured at the higher elevation, when it would be destroyed near the 
surface and up to 6 or 12 feet in height. Add to this that the air 
always contains more moisture nearer the ground than at a greater 
height, and consequently frost would prove more destructive to the fruit 
organs tlian to those in a drier as well as a warmer medium. We find 
also that the cold is greatest about sun-rising, when the blossoms on 
trees above 20 or 30 feet in height would catch the first rays and 
prevent the ill effects of frost, which at the same time might be 
destroying the blooms nearer the ground. A consideration of these 
facts should make us ask ourselves ffie question whether we are right 
in planting so extensively dwarf trees. 
