606 
Doctoring Trees. 
about the 22nd November, 1843 ; and guano and other manures used 
as a top-dressing in the spring, on Tuesday, 19th March, 1844. 
One acre of Farm-Tard Manure, 30 cart-loads . . . 4 10 0 
One acre of Peruvian Guano, 3 cwt. 2 qrs. 18 lb?, at 12». per cwf. • { '2 4 0 
One acre of Rajie-dust, 5 cwt. at C». 6d. per cwt. . . . I li 6 
One acre of Urate, 6 cwt. 2 qrs. at f>i. per cwf. . . .'1126 
One acre of Super-phosphate of Lime, 6 cwt. 1 qr. 4 lbs. at 7». percwt. 12 4 9 
One acre with no dressing . . . . , . .000 
Produce. 
Bush. Galls. 
40 6 
40 
38 
38 
53 
29 
Pounds 
of 
Straw. 
2,376 
2,11,6 
1,872 
2.028 
2,910 
1,472 
Number 
of 
Shocks. 
32 
30 
37 
35 
45 
29 
Weight 
per 
Bushel. 
62^ 
62 
61 
60 
61 
61 
Increase. 
Bush Galls. 
11 
11 
9 
9 
24 
0 
Kijigsdoicn, near Sittingbourne. 
XVII. — On Medical Treatment for Sick Trees. By Sir C. 
Lemon, Bart., M.P. 
To Ph. Pusey, Esq. 
My dear Sir, — Seme time ago I mentioned to you that I had in hand 
some experiments on the effect of chemical manures on young fir-trees. 
The plan of these experiments was as follows : — As the growth of trees 
is slow, and much time must be spent before any sensible effect can be 
produced by changes in the soil in which tliey are planted, it occurred 
to me that a quicker result might be obtained by working in an oppo- 
site direction. That is, not operating on healthy plants, and measuring 
effects by the comparative increase of growth ; but by taking sickly 
plants, and treating them as patients whose constitutions were debilitated, 
and ought to be renovated by the addition of such ingredients as might 
be required for healthy vegetation. I imagined that the effect of such 
medical treatment would be more rapidly visible; and that it would at 
least reveal a secret in vegetable nosology with respect to the individual 
cases under trial. I do not imagine that my results are of any value in 
their details. Extensive ex])criments, carefully collected facts, and a 
minute observation of the circumstances which modjfy the course of 
nature in her secret opeiations, are absolutely necessary before positive 
conclusions can be drawn as to the full measure of effect produced on 
the vegetable constitution by any given mode of culture ; and with re- 
spect to trees in their ordinary growth such a course of inquiry is to be 
meatured only by the life of man. Still I think that my results arc so 
