140 



EXPERIMENT STATION. 



[Jan. 



2. Acidity. 



The acidity of gluten feeds is manifest to the taste as well 

 as in titration with standard alkali. The following table gives 

 the acidity of a number of feeds collected on the Massachusetts 

 market in 1908. 



In determining total acidity, 5 grams of the feed were trans- 

 ferred to a bottle of approximately 500 cubic centimeters capac- 

 ity, together with 100 cubic centimeters of distilled water. The 

 bottle was then placed in the shaker for fifteen minutes, after 

 which the solution was filtered and an aliquot titrated against 

 N/10 NaOII, using phenolphthalein as an indicator. 



(a) Total Acidity (calculated as II ^^SO^). 



Blank .08 cubic centimeter.] 



Laboratory Number. 



Acidity 

 (Per Cent.). 



370, . 



371, . 

 391, . 

 3t)-2, . 



393, . 



394, . 

 39i), . 



459, . 



460, . 

 4G1, . 

 462, . 

 4C3, . 

 506, . 



513, . 



514, . 

 539, . 

 568, . 



602, . 



603, . 



604, . 

 637, . 

 657, . 

 687, . 

 697, . 

 770, . 



795, . 



796, . 



Medium, . 

 Medium, . 

 Medium, . 

 Medium, . 

 Medium dark, 

 Dark, 



Medium light, 

 Dark, 

 Medium, . 

 Light, 

 Dark, 

 Medium, . 

 Very light. 

 Dark, 

 Light, 

 Light, 

 Dark, 



Medium, . 

 Medium, . 

 Medium, . 

 Light, 

 Dark, 



Medium, . 

 Medium, . 

 Dark, 



Medium, . 

 Medium, . 



Slight acid. 

 No acid. 

 Distinct acid 

 No acid, 

 Sharp acid, 

 Sharp acid. 

 No acid. 

 Acid, . 

 Shai-p acid. 

 Slight acid. 

 Sharp acid. 

 Slight acid. 

 No acid. 

 Slight acid. 

 No acid. 

 No acid. 

 Sharp acid. 

 Slight acid. 

 Slight acid. 

 Slight acid. 

 No acid, 

 Acid, . 

 Sharp acid. 

 No acid. 

 Sharp acid. 

 Slight acid. 

 Sharp acid, 



.62 

 .15 

 • 72 

 .31 

 .91 

 .96 

 .06 

 .55 

 .86 

 .73 



1.21 

 .74 

 .06 

 .66 

 .20 

 .17 

 .86 

 .57 

 .70 

 .63 

 .38 

 .59 

 .90 

 .31 

 .95 

 .63 



1.02 



Color and taste were observed jjrcvious to determining acidity. 



