for Twenty Years in succession on the same Land, 157 
season than it did in 1854, or a worse result, on some point or 
other, than in 1856. But, looking chiofly to the results obtained 
under the best conditions of manuring, and the general characters 
of the ])roduce, there can be no doubt that the seasons selected 
do, upon the whole, represent, respectively, the least, and the 
most, productive of the series. 
In the first place, the weight per bushel of dressed corn was 
from 4^ lbs. to nearly 8 lbs. less in the bad than in the good 
year, or from about 8 J to nearly 15 per cent, less in the one case 
than in the other. Under almost every condition of manuring, 
185G was the worst season, so far as this point is concerned ; but 
several other seasons gave higher weight per bushel than 1854. 
It is obvious that, Avith a difference of from 8J to 15 per cent, 
in the weight of the bpshel, a comparison of the actual number of 
bushels of dressed corn in the two seasons would much underrate 
the difference in the amount of produce, greatly to the disad- 
vantage of the most productive one. Accordingly, the quantity 
of total corn, per acre, has, in each case, been calculated into 
bushels of the assumed uniform weight of 52 lbs. per bushel ; and 
the results of this calculation are given in the second division of 
the Table. 
There was, without manure, in the bad season about in 
the good season 37f bushels of corn, or a difference of rather 
more than 22 bushels between the two ; and also a difference in 
the quantity of straw amounting to 13 cwts. per acre. 
With farmyard-manure, the unfavourable season of 1856 gave 
scarcely 32 bushels, whilst 1854 gave rather over 60 bushels, or 
a difference of bushels of corn; and there was also a dif- 
ference of 17^ cwts. of straw. 
Lastly, the three most productive artificial manures gave, 
respectively, in 1856, 30^, 36|^, and 35 1 bushels of corn, and in 
1854, 66, 68, and 65|^ bushels, or a difference in favour of the 
good year of 35J, 31f, and 30J bushels of corn, besides 19J, 16, 
and 11=1 cwts. of straw. 
Thus, with one and the same expenditure for manure, there 
was a difference in the quantity of produce obtained in the two 
seasons of from 30 to 35 bushels of corn, and in one case of neaily 
a ton of straw, or not much less than would represent the average 
barley-crop of many localities. 
It is worthy of remark that, whilst the season of 1856 was far 
worse than that of 1853 as regards both the quantity and the 
quality of the barley-crop, 1853 was, for the experimental wheat 
(which that year could not be sown until the spring), in every 
particular worse than 1856. Again, whilst 1854 was a decidedly 
more productive barley-year than 1863, yielding under almost 
every condition of manuring not only more corn, but considerably 
