200 
WOOD AND METAL HOT-HOUSES. 
The proper period for this plan ,to be put in operation is February 
to the middle of March, and where it is adopted, the luxuriant foli¬ 
age, the trees will put forth and maintain, will forcibly strike the 
observer, and convince him of its efficacy : yet, where there are a 
great number of trees, from some undefined cause, there may be a 
slight attack of caterpillars, in which case it will be necessary to take 
a small and finely perforated dredger, containing white hellebore 
powder, and give a slight dusting to that part of the tree where their 
devastations have commenced, which will put an instantaneous stop 
to their ravages. 
In stating the quantum of lime to be applied to a tree at two 
pounds, I beg to be understood, that I am speaking of those sorts of 
lime only, which possess the most caustic qualities; such, for in¬ 
stance, as Warmsworth, in Yorkshire ; but in situations where lime 
of a more mild and fertilizing nature can be readily obtained, such, 
for instance, as Knottingley, in the same county, or Crich in Der¬ 
byshire, I would recommend shovelsful for gooseberry and currant 
trees, and barrowsful applied with an unsparing hand to every part 
of a kitchen garden. In most gardens, it is customary to apply fre¬ 
quent and constant dressings from the stable-yard, and to the utility 
of that plan, I presume there will be no dissent; yet, where such 
course has prevailed for a series of years, a free application of lime 
will produce such stimulating and invigorating effects, as nothing 
short of demonstration can convey to the understanding. 
Henry Dyson. 
Doncaster , Feb. 10 th, 1833. 
ARTICLE IV. 
COMPARATIVE REMARKS ON WOOD AND METAL HOTHOUSES. 
BY MR. WM. BROWN, JuN. 
I have penned a few remarks founded on my own observation re¬ 
specting the production of fruits in metallic roofed hot-houses. I 
think there is a great necessity that our more eminent experienced 
gardeners should bestow upon us, their candid opinions on the sub¬ 
ject, for bringing their observations together, will be evidently 
the safest way to obtain a proper conclusion. Wooden houses, I am 
satisfied have the advantage of being more durable than metal; but 
the latter admits double the light; this accelerates the vital actions of 
