i9i i.] Summary of Agricultural Experiments. 143 
Correlation between the Number of Eyes in Seed Potatoes and the 
Yield (Deutsche Landw. Presse, February Sth, 191 1). — Tests carried 
out with four varieties of potatoes at the Agricultural Station at Ope, 
in Sweden, in 1908, appeared to show the existence of some definite 
connection between the number of eyes in the "sets" and the yield. 
Further experiments were undertaken in 1909 and 19 10 at three 
Swedish Experiment Stations. As a rule the number of eyes can be 
taken as proportional to the size of the tuber, but in these trials tubers 
of the same size, but with different numbers of eyes, were chosen as 
far as possible. It was again established that the number of eyes in 
the sets has an influence on the yield, both the weight and number 
of the tubers increasing with the number of eyes. The following were 
some results obtained : — 
Yield from 10 sets. 
Variety. 
No. of eyes. 
Weight. 
No. of tubers. 
lb. 
White " Jemtland " 
4'c- 
8 6 
156 
IO*2 
138 
244 
" Mandel " 
3-6 
S"3 
127 
IO'I 
io-8 
270 
98 
9'5 
177 
Yield from 25 sets. 
8/2 
21-4 
2S7 
126 
30 • 6 
497 
It is suggested that the productivity of a variety can be raised by 
making use of these results, since it was found that the characteristic 
of a large number of eyes in the sets was transmitted to the crop of 
tubers obtained; e.g., the following relation between the number of 
eyes in the sets and in the tubers yielded was obtained in 1909 : — 
Number of eyes 
in sets. 
Number of eyes in potatoes harvested. 
Large tubers. 
Average. 
Small. 
6-4 
12-4 
9-8 
130 
6-6 
9'9 
6-8 
77 
Varieties of Cereals and Thick and Thin Seeding of Oats (Field 
Expts. in Staffs and Salop and at Harper Adams Agric. Coll., Joint 
Rept., 1910). — Sixteen varieties of wheat were tried in 1910 on a' good 
loam soil previously under seeds, which had been dressed with 8 tons of 
farmyard manure in July, 1909. The yields exceeded those of any 
previous year, and all the crops were harvested in good order. There 
were no great differences between the yields of the English wheats, but 
Browick Grey Chaff again gave the largest yield (54 bush, per acre), 
and the most profitable return per acre for grain and straw. The next 
in order were Regenerated Squarehead, Victor, and White Wheat, all 
