BETWEEN THE VISCOSITY OF LIQUIDS AND THEIR CHEMICAL NATURE. 633 
Homologues (continued). 
i 
Isopropyl chloride. 
644 
Isobutyl chloride ..=.... 
760 
Methylene ehloride. 
600 
Ethylene chloride. 
737 
Methyl sulphide. 
578 
Ethyl sulphide. 
812 
Dimethyl ketone. 
572 
Diethyl ketone. 
785 
Methyl ethyl ketone. 
671 
Methyl propyl ketone. 
796 
Formic acid. 
456 
Acetic acid. 
593 
Propionic acid. 
742 
Butyric acid. 
842 
Acetic anhydride. 
838 
Propionic anhydride. 
1036 
Benzene . 
688 
Toluene. 
821 
Ethyl benzene. 
939 
Difference. 
116 
137 
(117) 
(107) 
125 
137 
149 
100 
(99) 
133 
118 
It is evident from the table that the effect of an increment of CHg in chemical 
composition on the molecular viscosity is here much more definite than at the boiling- 
point. Although the numbers show that the effect apparently slowly diminishes as 
each homologous series is ascended, yet it may be taken as a first approximation that 
the efiect of CHg is about the same in all the homologous series investigated. The mean 
difference for CHg is about 120 units, the largest differences from the mean being in 
MDCCCXCIV.—A. 4 M 
