250 



C. U. C. p. ALUMNI JOURNAL 



move alcohol, the original volume of 

 liquid being maintained by addition of 

 water. The liquid is then made slightly 

 acid and extracted twice with ether. The 

 combined extracts are allowed to vapor- 

 ize at a low temperature, and the residue, 

 in the form of fine crystalline needles, 

 is dissolved in lo mils of water. To this 

 solution are added 3 drops of diluted 

 (i in 10) solution of hydrogen dioxide, 



3 drops of diluted (i in 10) solution 

 of ferric chloride, and 3 drops of 3 per 

 cent, ferrous sulphate solution. If ben- 

 zoic acid was present a violet coloration 

 (salicylic acid) will appear in about one- 

 half minute. The same method may be 

 employed if the presence of salicylic acid 

 is also suspected, only in that event, the 

 solution of ferric chloride is added with- 

 out previously oxidizing with hydrogen 

 dioxide. 



Aromatic Sulphuric Acid, U. S. P. 



W. S. D. Penniman, W. W. Randall, 

 C. O. Miller, and L. H. Enslow, in /. 

 Ind. Eng. Chem., 19 16, comment upon 

 the official process of assay, as follows : 

 In order that complete hydrolysis of 

 ethylsulphuric acid may be effected, when 

 this is heated with water, is is necessary 

 that the alcohol formed be removed. In 

 case of aromatic sulphuric acid, no ap- 

 preciable hydrolysis of the ethylsulphuric 

 acid takes place, until nearly all of the 

 free alcohol has been expelled. For this 

 reason methods such as given in the U. 

 S. P., in which the sample is diluted with 

 water and then heated under a reflux 

 condenser, always show low results. 

 Complete hydrolysis can be effected in 

 most cases by heating the sample with 

 six times its volume of water, and heat- 

 ing in an open vessel on a water bath, 

 strongly boiling, for a period of at least 



4 hours. 



Oxidation of Manganous Salts. 



W. Prandtl, Berhn, 1916, states as 

 follows: If a cold solution of a man- 

 ganous salt be acidified in excess with 

 strong hydrochloric acid, and a few 

 drops of a solution of sodium nitrite 

 added, the liquid assumes an intense 

 brownish-yellow color, owing the forma- 

 tion of a manganic salt. The same re- 

 sult is obtained when cold strong hydro- 

 chloric acid is mixed with a small quan- 

 tity of the nitrite solution, and a few 

 drops of a manganous solution added. 

 When a neutral solution of a manganous 

 salt is mixed with sodium nitrite (neu- 

 tral) in excess and oxalic acid added, an 

 intense cherry-red coloration is noted, 

 owing to the formation of manganic 

 oxalate. This reaction is said to be 

 extremely sensitive and to be of value 

 in the detection of small quantities of 

 manganese in presence of larger quan- 

 tities of iron. 



Marine Animal Oils. 



The detection of marine animal oils in 

 oils, fats and soaps was made the sub- 

 ject of study by J. Marcusson, and H. 

 von Huber, who report their findings in 

 Mitt. K. Materialpnief., 1916, as follows: 

 The product "neutraline," which is pre- 

 pared by subjecting marine animal oils 

 to a high temperature, in absence of air, 

 or in presence of an indifferent gas, or 

 other similar products do not respond to 

 the octobromide test. They, however, 

 show positive results with the Tortelli 

 and Jaffe color reaction test. They are 

 also characterized by a high specific 

 gravity, usually above 0,930, and a high 

 degree of viscosity. Four samples ex- 

 amined showed from 31,7 to 40,5 Engler 

 degrees, at 20° C. While it is true that 



