394 
Field Experiments on Potatoes. 
Table II. — Showing the Amount in lbs. of Large, Second, Small, and 
Diseased Potatoes obtained from each Plot of of an Acre. 
riots. 
Name of Manure. 
Large. 
Second. 
Small. 
Diseased 
Total. 
1 
81 
33 
67^ 
12 
193J 
266J 
113 
75 
59 
3 
384 
115 
43| 
93J 
636 
(Miueral Superphosphate .. ..] 
4 
\ aud i 
269 
50 
27 
80 
42S 
5 
102 
o / 
^ L 
246 
(; 
269 
50 
27 
80 
426 
99 
49J 
47 
26 
2211- 
j Mineral Superphosphate . . . . 1 
8 
I and \ 
211 
G8 
551 
58 i 
393 
9 
478 
90 
62 
140 
770 
10 
104^ 
53 
42 
26 
In Table V. (p. 396), the preceding results have been calcu- 
lated per acre. 
The produce on the three unmanured plots, as might have 
been expected, varied to some extent, as did also that on the two 
plots to which dung was applied. 
The greatest variation in the unmanured plots amounts to 
9 cwts. 1 qr. 14 lbs., and to 1 ton 3 cwts. 1 qr. and 20 lbs. in 
the dunged plots, as will be seen more clearly in the following 
table : — 
Table III. — Showing the Averages of the Plots manured with Dung and 
unmanured, and the Differences between them. 
No. 1. 
No 5. 
No. 10. 
AVEItAGK. ; 
Unmanured . • . 
Manured with Dung 
Increase by Dung . 
Tons. cwts. qrs. lbs. 
1 14 2 6 
No. 3. 
5 13 2 8 
Tons. cwts. qrs. lbs. 
2 3 3 20 
No. 9. 
G 17 2 0 
Tons. cH ts. qrs. 
2 0 1 
Tons. cwts. qrs. lbs. 
1 19 2 
6 5 2 4 
•1 5 3 23i 
The variations in the weight of the produce from both the 
unmanured and, especially from the dunged plots, are rather 
larger than it is desirable they should be, but not greater than 
they are usually found to be in unpropitious seasons in similar 
experiments. 
Taking the average produce of the unmanured plots as a basis 
for calculation, we obtain the following increase or decrease in 
each experiment : — 
