184 METHODS OF ANALYSIS 



33 PRESERVATIVES.-TENTATIVE. 

 Proceed as directed under X. 



34 COLORING MATTERS.-TENTATIVE. 

 Proceed as directed under XI. 



35 SWEETENING SUBSTITUTES.-TENTATIVE. 

 Proceed as directed under X, 12, 36 or 37. 



BIBLIOGRAPHY. 



1 Chem. Ztg., 1895, 19: 552. 



" Z. angew. Mikros., 1896, 2: 260. 



" Z. Nahr. Genussm., 1911, 21: 185. 



* J. Assoc. Official Agri. Chemists, 1915, 1: 480. 



6 Ibid.; U. S. Bur. Chem. Bull. 162, p. 65. 



6 Arch. Chem. Mikros., 1914, 7: 285; Abs. Z. Nahr. Genussm., 1915, 



