140 Dr. 0. H. Lees on the Viscosities of 



suggest immediately the empirical formula : — 

 y n = v 1 v 1 n -\-v 2 r ]2 n 



where n is a constant to be determined for each mixture. 

 In the following tables the values of n are given and the 

 calculated and observed values for various mixtures are 

 compared *. 



Carbon Tetrachloride and Benzine at 60° C. n= — *42. 



Per cent. 

 Benzine by volume. 



Observed r\. 



Calculated 77. 





 34-4 



58-5 

 79-2 

 100 



•00582 

 503 

 456 

 422 

 391 



•00582 

 502 

 45G 

 422 

 391 



Ethyl Ether and Benzine at 25° C. n = — *50. 



Per cent. 

 Benzine by volume. 



Observed r\. 



•00230 

 282 

 362 

 438 

 599 



Calculated rj. 







25-2 

 52-6 

 724 

 100 



•00230 

 282 

 361 

 438 

 599 



Nitrobenzine and Benzine at 25°. 



-•50. 



Per cent. 

 Benzine by volume. 



Observed q. 



Calculated r\. 







18-8 

 45-2 

 84-6 

 100 



•01834 



1417 



1017 



681 



599 



•01834 

 1410 

 1020 



689 

 599 



* In most of the cases which follow no attempt has been made to 

 determine n to a greater degree of accuracy than 2 or 3 units in the 

 second decimal place. 



