156 



REPORT — 1881. 



apparatus similar in form to that used by Sprengel, by means of which 

 great accuracy can be attained. The specific gravities are given in relation 

 to water at 4°. 



The specific refractions of the alcohol, glacial acetic acid, and the 

 distilled water used in the following experiments were determined with 

 special care, and gave the following results : — 



I. Liquid pJienoJ, and ]}henol in ahoJiolic and acetic acid solutions. 



The phenol used in these experiments was pure, as ascertained by its 

 boiling point. The values obtained for the specific refraction of liquid 

 phenol at 40° and 45°, viz., •4850 and -4848, are closely approximate to 

 that obtained by Briihl (' Journ. Chem. Soc.,' abst., 1880, p. 782) for 

 phenol at 20°, viz., -4862. Further, these results agree very well with 

 the mean of the specific refi-actions obtained from the alcoholic and acetic 

 acid solutions. 



The following table contains the nnmbers obtained ; the specific 

 gravities were taken at the temperature of observation, water at 4° being 

 taken as unit : — 



Experiments made with phenyl ether (PhoO) yielded results similar to 

 those obtained with phenol. The refractive index for Fraunhofer's line 

 A of liquid phenyl ether at 24° was found to be 1*5702, and its specific 



