1904] 



Mills — Molecular Attraction. 



149 



600 



500 



400 



300 



200 



100 



50° !00° 150° 200° 250° 300° 



Diagram 3. 



For water, add 900 to the ordinates shown by the diagram. 



brom-benzene, iodo-benzetie, and hexaraethyletie, the irregu- 

 larities of the PV curve are more probably due to the vapor 

 density (see second paper, p. 400), and are especially interest- 

 ing- because they occur at just the point where were obtained 

 divergent values for //. Reference to the preceding- paper 

 will show that di-isobutyl, brom-benzene, and iodo-benzene, 

 were the only substances, except stannic chloride and the 

 associated substances, giving divergences (which have not 

 been explained as due to multiplication of error in calculat- 



8P 

 ing the -«7p ) greater than two per cent, from the mean value 



adopted for fi'. Hexamethylene shows likewise a smaller 



