was used.

In regard to some of the results this year, Messrs. Lawes and Gilbert
have the following concise and interesting remarks:

"At this third experimental harvest, we have on the continuously
unmanured plot, namely, No. 3, not quite 18 bushels of dressed corn,
as the normal produce of the season; and by its side we have on plot
10_b_--comprising one-half of the plot 10 of the previous years, and so
highly manured by ammoniacal salts in 1845, but now unmanured--rather
more than 17-1/2 bushels. The near approach, again, to identity of
result from the two unmanured plots, at once gives confidence in the
accuracy of the experiments, and shows us how effectually the preceding
crop had, in a practical point of view, reduced the plots, previously so
differently circumstanced both as to manure and produce, to something
like an uniform standard as regards their grain-producing qualities.

"Plot 2 has, as before, 14 tons of farm-yard manure, and the produce is
27-1/4 bushels, or between 9 and 10 bushels more than without manure of
any kind.

"On plot 10_a_, which in the previous year gave by ammoniacal salts
alone, a produce equal to that of the farm-yard manure, we have again a
similar result: for two cwts. of sulphate of ammonia has now given 1,850
lbs. of total corn, instead of 1,826 lbs., which is the produce on plot
2. The straw of the latter, is, however, slightly heavier than that by
the ammoniacal salt.

"Again, plot 5_a_, which was in the previous season _unmanured_, was
now subdivided: on one-half of it (namely, 5_a_1) we have the ashes of
wheat-straw alone, by which there is an increase of rather more than one
bushel per acre of dressed corn; on the other half (or 5_a_2) we have,
besides the straw-ashes, two cwts. of sulphate of ammonia put on as a
top-dressing: two cwts. of sulphate of ammonia have, in this case, only
increased the produce beyond that of 5_a_1 by 7-7/8 bushels of corn and
768 lbs. of straw, instead of by 9-3/4 bushels of corn and 789 lbs. of
straw, which was the increase obtained by the same amount of ammoniacal
salt on 10_a_, as compared with 10_b_.

"It will be observed, however, that in the former case the ammoniacal
salts were top-dressed, but in the latter they were drilled at the time
of sowing the seed; and it will be remembered that in 1845 the result
was better _as to corn_ on plot 9, where the salts were sown earlier,
than on plot 10, where the top-dressing extended far into th