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PUBLIC DOCUMENT — No. .31. 



115 



extracted at lea.st i)art of the oil on which they 'worked with 

 ether. A more accurate determination, by means of an ordinary 

 I)iciiometer, jiroved unsatisfactory at the low temperature de- 

 sired because of the viscid nature of the material. 



The specific viscosity was reporte<l by F. W. Farrell ^ as 

 8.43, using a Boverton-Redwood viscosimeter. This indicates 

 the rate of flow at 70° F., as compared with a like volume of 

 water at the same temperature. 



The refractive index Kd and mean dispersion Nf — ^c 

 were determined at several temperatures by an Abbe refrac- 

 tonieter with a watcn* jacket. 



The Valenta test, or turbidity point of equal volumes of oil 

 and glacial acetic acid, was 60° C. This test is based on solu- 

 bility. 



(&) Chemical Tests. 



In the chemical examination of the oil the usual methods, 

 w^ith only slight modifications, were followed, unless otherwise 

 stated, and they are too well known to need descrii)tion. 



' Of the Emerson Laboratory, Springfield, Mass. 

 a Calpulated from an acidity of 2.28 per cent, as oleic acid, 

 s Excluded from the avenigc. 



< Vycstnik Obshch. Hig., Sudeb. 1. I'rakt. Med. 6 (1905), pp. 690-693; Abs. Exp. Sta. 

 Rec, 18, p. 858. 

 6 Average. 



