518 
Journal of Agricultural Research 
Vol. XXI, No. 8 
Table VIII.— Protein content and hardness of Kentucky wheats 
Variety. 
Ruby. 
Turkey Red. 
Gold Coin. 
Canadian hybrid. 
Dawson’s Golden Chaff 
Indiana Swamp. 
Harvest Queen. 
Hungarian. 
Lancaster Red. 
Pearl’s Prolific. 
Fulcaster. 
Kansas Mortgage Lifter 
Harvest King. 
Fultz. 
Jersey Fultz. 
Extra Early Oakley... , 
Beech wood hybrid. 
Improved Rice. 
Pootung. 
Protein 
content. 
Number of kernels in 
100, cut under a pres¬ 
sure of 4 pounds 
(1,818 gm.). 
Flinty 
grains. 
Starchy 
grains. 
Per cent. 
II. 63 
40 
56 
II. 85 
68 
96 
12.33 
94 
98 
12. 50 
78 
86 
12. 63 
68 
9 2 
12. 77 
56 
60 
13. 01 
96 
98 
13. 12 
80 
96 
13. 26 
76 
96 
i 3 - 9 1 
68 
86 
14. 01 
46 
68 
14. 04 
5 ^ 
84 
14. 06 
70 
90 
14. 25 
75 
98 
14. 66 
80 
94 
14. 68 
55 
66 
95 
76 
78 
* 5 - n 
66 
9 2 
><>• 55 
50 
70 
The data from the Kentucky Agricultural Experiment Station are not 
presented in the same manner as those from the Kansas and the Cali¬ 
fornia Stations and can not be considered in exactly the same way. 
Instead of the number of kernels crushed under different weights, the 
percentages of kernels crushed under the same weight (4 pounds, or 1,818 
gm.) are given. The kernels are divided into two classes, flinty and 
starchy, and the percentage number of kernels out of 100, cut with the 
4-pound weight, is given for each class. 
Table IX.— Constants involved in the calculation of the correlation coefficient of mean 
breaking point and protein content of Kentucky wheat 
Mean. 
Standard deviation. 
Correlation 
coefficient. 
Percentage of 
kernels cut. 
Protein 
content. 
Percentage of 
kernels cut. 
Protein 
content. 
68.18 
±0. 2256 
Per cent. 
13-65 
±0-1553 
14.58 
± 1-5953 
Per cent. 
I.OO39 
± O.1098 
°-°335 
±0-1545 
Thus, it is not possible to correlate the percentages of protein with a 
series of different crushing or breaking points as in the other experiments. 
This difficulty was avoided by calculating the correlation coefficient of 
the percentages of flinty kernels which were cut under the given weight 
