12 
BULLETIX 557, U. S. DEPARTMENT OF AGRICULTURE. 
This diagram shows the variation in weight per bushel of soft red 
winter, durum, hard red winter, and hard red spring wheats, and 
also the variation in flour yield for the different ranges in weight 
per bushel. 
It will be noted from figure 9 that as between classes there seems 
to be little relation between weight per bushel and milling yield. 
To illustrate: Although the durum samples averaged highest in 
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Fig. 0. — Diagram showing the relation between the weight per bushel and the flour 
yield of four important commercial classes of wheat. The samples represent the 
crops of 1008 to 1013. inclusive, except those of soft red winter wheat, of which 
are included samples of the crops of 1911, 1012. and 1913 only. 
weight per bushel, the average flour yield is next to the lowest, and 
spring wheat although lowest in weight per bushel is next to the 
highest in average flour yield. 
These variations in the relation of weight per bushel to flour yield 
among the several classes seem to be associated with differences in 
the shape, size, and density of kernels and perhaps also the thickness 
of the bran, any or all of which may be varietal characteristics or 
