Relation of Size of Seed and Sprout Value to Yield 7 
seed compared with the large produced 80 per cent as many 
culms per plant, 72 per cent as high grain yield, 77 per cent as 
great straw yield, and 77 per cent as great total yield. In these 
testS) the small seeds planted averaged 52 per cent as heavy as 
the large. 
11. In yield tests comparing large and small seeds planted 
both in equal numbers and equal weights at rates normal for the 
large seed, (1) the small seed of winter wheat yielded 4 per cent 
less than the large when planted in equal numbers, while the 
yields were equal when planted at equal weights; (2) the small 
seed of oats yielded 11 per cent less than the large when sown in 
equal numbers, and both yielded alike when equal weights of 
seed were used; (3) when sown in equal numbers, the small seed 
of spring wheat yielded 10 per cent less than the large seed, 
while it yielded only 1 per cent less when equal weights of seed 
were used; (4) as an average for all three crops, the small seed 
yielded i of 1 per cent less than the large when equal weights of 
seed were sown, and 8 per cent less when planted in equal numbers. 
12. During 12 years of continuous grading of Turkey Red 
and Big Frame winter wheat (by means of a fanning mill), the 
heaviest one-fourth seed has averaged 0.4 bushel more, while the 
lightest one-fourth seed has yielded 0.5 bushel less than the un- 
selected seed. 
13. As an average for 12 years' continuous use of the fanning 
mill, the heaviest and lightest one-fourth seed of Kherson oats 
have yielded respectively 0.83 bushel and 0.09 bushel more than 
the ungraded seed. 
During 8 years' continuous use of the fanning mill, the lightest 
one-fourth seed of American Banner oats has yielded 1.43 bushels 
more than the heaviest one-fourth. In a 4-year period the un- 
graded seed was also compared and yielded 1.6 bushels less than 
the light seed, while the heavy seed yielded 3.67 bushels less than 
the lightest seed. In this variety, the selection of the light seed 
evidently resulted in securing the best adapted strains within the 
variety. 
14. From a review of 60 experiments by various investigators, 
regarding the relative yields of grades of small grain seeds, the 
following principles are indicated : 
(1) When space-planted to permit maximum development 
of the individual plants, a higher yield per plant is obtained from 
large than from small seed. 
(2) When planted in equal numbers at a rate optimum for 
large seed, a lower yield is obtained from small than from large 
seed. 
(3) When planted in equal weights, at a rate optimum for 
