i'62 Report of Experiments on the Grmoth of Barleij. 
of the two periods will not be accurately represented by the actual 
number of bushels of dressed corn in each case. Accordingly, 
as before, the quantity of total corn has been calculated into 
assumed bushels of the uniform weight of 52 lbs. These results 
show, without manure, with mineral manure alone, and with am- 
monia-salts alone — that is, with defective soil-conditions, a con- 
siderable deficiency of corn over the second half of the period ; 
the greater the more defective the manuring, and the greater the 
relative deficiency of nitrogen in the soil; for the falling off 
is considerably more marked with mineral-manure alone, than 
with ammonia-salts alone. Under the same three soil-conditions 
there is as great, or even a greater deficiency of straw, and conse- 
quently of total produce also, during the later years. 
With farmyard-manure, on the other hand, the annual use of 
which has resulted in a very great accumulation within the soil, 
not only of nitrogen, but probably of every mineral constituent 
also, there has been a considerable excess of produce of both corn 
and straw, but especially of corn, over the second as compared 
- with the first ten years. 
With the ammonia-salts and mixed mineral manure together, 
by which also the soil has become much richer in most mineral 
constituents, and at any rate less exhausted if not richer in nitrogen 
than without manure or with mineral manure alone, there is again 
a slight increase of corn, but a slight deficiency of straw, over the 
Jater years. 
The general conclusion from the above results, as well as from 
others, not here specially referred to, is, that the earlier years of 
the twenty were, on the average, as favourable, if not more favour- 
able, for quantity of total produf:e — that is for luxuriance — than 
the later ; but that the later seasons were much more favourable 
for tendency to seed-forming, and also for the maturation of the 
^rain. 
Bearing in mind this conclusion as to the progressive or retro- 
gressive characters of the seasons themselves, we shall be in a 
position the better to judge of the effects of the different manures 
when used year after year, for twenty years in succession, on the 
same land. 
(To he continued.) 
