368 
MESSRS. J. B. LA WES AND J. H. GILBERT ON THE RESULTS OE 
and mineral matter, over the eight years of the application of the clung, over the first 
six, and the second six, succeeding years, and over the total period of 20 years, on both 
plots 2 and 1. For comparison, there is also given the average produce on the un¬ 
manured plot 3, over the same periods ; and lastly, the increase on plots 2 and 1 
respectively, over the produce without manure, and the increase on plot 1 with, over 
the yield on plot 2 without, the ammonia-salts. 
Table XX.-—Average, per acre per annum, by Farmyard Manure alone, and with 
Ammonia-Salts ; and by the residue of the Dung, also without and with Ammonia- 
Salts ; Plots 2 and L 
Average per acre per annum. 
Plot 3. 
Unmanured 
continuously. 
Plot 2. 
Farmyard 
manure alone 
8 years, 
1856-1863; 
uumanured 
12 years, 
1864-1875. 
Plot 1. 
Farmyard 
manure and 
ammonia- 
salts 8 years, 
1856-1863; 
ammonia- 
salts only 
12 years, 
1864-1875. 
Plot 2. 
+ or — 
unmanured. 
Plot 1. 
+ or — 
unmanured. 
Plot 1. 
+ or— 
plot 2 . 
Hat. 
lbs. 
lb?. 
lbs. 
lbs. 
lbs. 
lbs. 
First period, 8 years, 1856-1863 . . . . 
2665 
4804 
5538 
+ 2139 
+ 2S73 
+ 734 
Second period, 6 3 ears, 1864-1869 .... 
2699 
4846 
5366 
+ 2147 
+ 2667 
+ 520 
Third period, 6 years, 1870-1875 . . . . 
1692 
2517 
3331 
+ 825 
+ 1639 
+ 814 
Total period, 20 years, 1856-1875 .... 
2383 
4130 
4824 
+ 1747 
+ 2441 
+ 694 
Second period, per cent, + or — first period 
+ 1-3 
+ 0-9 
- 3-1 
Third period, per cent, + or — first period . j 
-36-5 
— 47"6 
-39-9 
Nitrogen. 
First period, 8 years, 1856-1863 .... 
37-2 
58-2 
68-3 
+ 21-0 
+ 31-1 
+ 10-1 
Second period, 6 years, 1864-1869 . . . . 
37-3 
53-3 
63-9 
+ 16-0 
+ 26-6 
+ 10-6 
Third period, 6 years, 1870-1875 .... 
23-0 
2P5 
41-0 
+ 4'5 
+ 18-0 
+ 13-5 
Total period, 20 years, 1856-1875 . . . . 
33-0 
47 '5 
58-8 
+ 14-5 
+ 25-8 
+ 11-3 
Second period, per cent. + or — first period 
+ 0-3 
- 8-4 
- 6-4 
Third period, per cent. + or — first period . 
-38-2 
-52-7 
-40-0 
Mineral Mattes (Ash). 
First period, 8 years, 1856-1863 .... 
160-5 
329-1 
370-5 
+ 168-6 
+ 210-0 
+ 41-4 
Second period, 6 years, 1864-1869. . . . 
15r2 
275"0 
291-8 
+ 122-8 
+ 139-6 
+ 16-8 
Third period, 6 years, 1870-1875 . . . . 
91-5 
136-4 
164-7 
+ 44-9 
+ 73-2 
+ 2S;3 
Total period, 20 years, 1856-1875 . . . . 
137-3 
255"0 
2S5-1 
+ 117-7 
+ 147'S 
+ 30-1 
Second period, per cent. + or — first period 
- 5-2 
-10-4 
-21"2 
Third period, per cent. + or — first period . 
-43-0 
— 58"6 
-55-5 
It will be convenient first to consider the effects of the farmyard manure used alone, 
