Vin] FOODS AND FEEDING STUFFS 119 



paper is used, weigh in a weighing bottle. In any case the crude fiber after drying 

 to constant weight at 110°C. must be incinerated and the amount of the ash deducted 

 from the original weight. 



69 WATER-SOLUBLE ACIDITY OF FEEDS.— TENTATIVE. 



Weigh 10 grams of the sample into a shaking bottle, add 200 cc. of water, and 

 shake for 15 minutes. Filter the extract through a folded filter and take a 20 cc. 

 aliquot (equivalent to 1 gram of sample) for the titration. Dilute with 50 cc. of 

 water and titrate with N/10 sodium hydroxid, using phenolphthalein as indicator. 



In reporting the acidity of feeds, state the results in terms of cc. of N/10 sodium 

 hydroxid required for neutralization. 



BIBLIOGRAPHY. 



» Z. Ver. Zucker-Ind., 1900, 37 (I): 357; 1913, 63 (I): 25; J. Ind. Eng. Chem., 

 1913,5:167. 



» J. Am. Chem. Soc. 1914, 36: 1566. 



» Ibid., 1906, 28: 663; 1907, 29: 541. 



«Ibid., 1902, 24: 1082. 



» Z. Rubenzucker-Ind., 1885, 35 (N. F.22) : 1012. 



• Ibid., 1889, 39 (N. F. 26) : 734. 



' Ibid., 1879, 29 (N. F. 16) : 1034. 



' Wein. Tables for the Quantitative Estimation of the Sugars. Translated by 

 Frew. 1896, p. 26. 



"Ibid., p. 33. 



»» Z. Rubenzucker-Ind., 1882, 32 (N. F. 19) : 606, 865. 

 11 U.S. Bur. Chem. Circ. 71. 

 " J. Am. Chem. Soc, 1904. 26: 266. 

 " U. S. Bur. Chem. Bull. 73, p. 173. 

 "J. Landw., 1900,43:379. 



