152 Manure . 
will occur to the reader on this fact. The superiority of No. 30 t6 
3 1 in the turnips is remarkable, and shews, that however powerful 
urine is for one crop, its effect quickly goes off. 
III. The result of the several applications of common salt is 
remarkable. Chalk and salt have an uncommon effect, and from 
the soda alone having so great a power, it seems evident that in the 
composition of muriat of soda, it is the soda to which we are to at- 
tribute the benefit. The various portions of salt tried (for the in- 
quiry is particularly interesting), and their general result, do not 
seem to permit any doubt of its efficacy as a manure. 
The largest quantity applied, having the effect in the turnips of 
counteracting a great drought, is remarkable. 
IV. The nitrate of potash, Whether in a state of solution or solid, 
has a great effect, but in the former case much superior to the lat- 
ter. 
V. In every application sulphat of lime is beneficial ; the sin- 
gle exception of No. 53 is so complex, that it does not merit atten- 
tion, especially as the quantity of spirit of wine was large. 
VI. In the experiments I made many years ago, spirit of wine I 
was almost uniformly mischievous or useless. I had reflected of- 
ten on a result which was so contrary to all expectation, and con- 
cluded that I must have applied the substance in too large quanti- 
ties. This year I lessened them considerably ; and the result is 
much more favourable : but here one tea-spoonful is better than 
four ; and half and quarter better than three. However, its being 
beneficial in five cases out of six, shews that it is an inquiry which 
i| 
merits further prosecution. 
VII. Spirit of hartshorn appears to advantage, and as the three 
pots No. 28, 29, and 30, are in the succession of diminished quan- 
tities, it shews that the smallest applied might have been too great 
for the first crop. 
But I forbear adding more remarks— here are too many, for this 
is more properly the readers’ work, whose conclusions may be ve- j 
ry different from mine.” 
I think this set of experiments may reasonably be pursued ; 
and the effect of charcoal dissolved in alkali in various proportions 
as well with heat and without, be usefully compared both as to 
effect and economy. T. C. 
