38 



STUDIES OF AMERICAN BARLEYS AND MALTS. 



most extraqt, a fact already established l^v Neumann a and Kunz. & 

 This is well illustrated in the following table : 



Relation between weight and r.rtrnd content for 



con* nt. 



of the tame protein 



The figures show that a high-protein barley may give a high 

 extract, provided the weight per 1,000 grains is large, and vice versa. 

 The size of the grain affects, therefore, the quantity of extract, other 

 factors being equal. This table also gives the relation between the 

 protein and extract content, showing the natural tendency for high- 

 protein barley to give less extract. There are. however, many indi- 

 vidual exceptions to this rule, as was found by Prior c in his work 

 on 2-row barley. 



RELATION OF THE PROTEIN CONTENT TO THE CHARACTER OF THE 



ENDOSPERM. 



Not only do the low-protein barleys weigh more per 1,000 grains 

 and contain more extract, but they are much more mealy after steep- 

 ing. For example, 31 samples of barley with an average protein con- 

 tent of 11.1 per cent have a coefficient of mealiness of 84, while 53 sam- 

 ples whose average protein content is 12.2 per cent have a coefficient 

 of mealiness of only 80. This difference is accentuated if only those 

 samples which contain over 12.2 per cent of protein are compared to 

 those containing less than 11.25 per cent. In this case the former 

 have a coefficient of mealiness of only 11 as compared with 87 for 

 the latter. 



Yet the actual number of flinty grains in the samples, before steep- 

 ing, is about the same in each class, the high-protein samples contain- 

 ing 16 mealy and 43 steely grains per 100 and the low-protein barleys 

 containing 15 per cent mealy and 44 per cent steely. The behavior 



Adflress at the meeting of Versuclis- imd Lehranstalt fur Brauerel, October, 

 1906. 



6 Woe-hen schr. Bran., 1906, 23: 530. 

 r Loc. cit. 



