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/3 NaOII, using phonoliihthalein as an indicator. 



(a) Total Acidity {calculated as H^SO^). 



[Blank .OS cubic centimeter.] 



Laboratory Number. 



Color. 



Taste. 



Acidity 

 (Per Cent.). 



370,. 

 371, . 

 Sill, . 



392, . 



393, . 



394, . 

 39.5, . 



459, . 



460, . 

 4C1, . 

 4G-2, . 

 463, . 

 506, . 

 513, . 

 614, . 

 539, . 

 568, . 

 60-2, . 



603, . 



604, . 

 637, . 

 C57, . 

 687, . 

 697, . 

 770, . 



795, . 



796, . 



Medium, 



Medium, 



Medium, 



Medium, 



Medium d; 



Dark, 



Medium lij 



Dark, 



Aledium, 



Light, 



Dark, 



Medium, 



Very light. 



Dark, 



Light, 



Light, 



Dark, 



Medium, 



Medium, 



Medium, 



Light, 



Dark, 



Medium, 



Medium, 



Dark, 



Medium, 



Medium, 



irk, 

 ht, 



Slight acid, 

 No acid. 

 Distinct acid 

 No acid, 

 Sharp acid, 

 Sharp acid. 

 No acid. 

 Acid, . 

 ShaiiJ 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, 

 A (-id, . 

 Shari) acid. 

 No acid. 

 Sharp acid. 

 Slight acid, 

 Sharp acid, 



.62 

 .15 

 .72 

 .31 

 .91 

 .96 

 .06 

 .55 

 .86 

 .73 

 1.21 

 .74 

 .06 



.(;6 



.20 

 .17 

 .86 

 .57 

 .70 

 .03 

 .38 

 ..59 

 .90 

 .31 

 .95 



.(;;{ 



1.02 



Color and taste were observed previous to determining acidity. 



