Nov. I, 1919 



Yellow-Berry in Hard Winter Wheat 



165 



microscopic field were measured, fairly miiform and accurate results 

 have been obtained. 



Table V shows the frequency of distribution of the starch grains with 

 respect to size, expressed in micromillimeters (microns) in nine of the 

 races or pure strains just considered. From this table it appears that, 

 in both the hard kernels and the yellow grains, the greatest number of 

 individual cases (the mode) falls into the class of 25 to 29.9 micromilli- 

 meters diameter, although the average size of the starch grains in the 

 hard kernels was about 2.3 microns greater than in the yellow-berry kernels. 



TabIvE V. — Distribution of starch grains 0/ yellow-berry and hard kernels with respect to 



size 



I Diajneter of starch grains expressed in micromillimeters ( '- J I 



Other physical characteristics of the yellow-berry and hard kernels — 

 for example, specific gravity, average kernel-weight, and volume-weight, 

 are given in Table VI for 10 strains of wheat used for the study of the 

 size of starch granules. The volume-weight, the test weight per bushel, 

 and the average weight per kernel is higher for the yellow-berry than for 

 the hard kernels. The specific gravity is somewhat higher in the hard 

 wheat. These results agree in general with those previously reported 

 by the writer (6), except that in the earlier investigation the average 

 weight per kernel was higher for the hard wheat. 



Snyder (7, 8) has investigated the comparative weight of light and 

 dark seeds taken from the same samples of varieties from 31 miscellaneous 



