334 PROCEEDINGS OF THE AMERICAN ACADEMY. 



TABLE VI. 



arcc. Water; yc.c. Benzol; 5 c.c. Acetone. Temp. 20°. 

 Formula a: 'i y = Ci; «i = 1.40 ; log C^ = 0.262. 



Water. Benzol. 



There is but one exception, in the chloroform- water-ace tone series. 

 As chloroform and water behave normally with alcohol (Table I.), 

 water and acetone with benzol (Table VI.), the disturbing effect must be 

 due to chloroform and acetone in presence of each other. I have not 

 yet had time to investigate mixtures of chloroform and acetone in the 

 absence of water, to determine whether they are abnormal in respect 

 to any other physical properties. In the other five cases the agree- 

 ment between observed and calci^lated values is a remarkable one, well 

 within the limits of experimental error, and this in spite of the wide 

 range that the measurements cover. In the benzol- water-alcohol 

 series the ratio of benzol to water varies as one to forty thousand ; in 

 the chloroform-water-alcohol series the ratio chloroform-water varies as 

 one to twelve thousand. In the last measurement of Table I. the 

 chloroform forms over 809^ by volume synthetically of the solution, 

 so that in this instance we are well beyond the realms of the " dilute 



