654 
MESSRS. T. B. THORPE AND J. W. RODGER ON THE RELATIONS 
Homologues (continued). 
Methyl sulphide 
Ethyl sulphide . 
240 
39.3 
Dimetliyl ketone. 
Diethyl ketone. 
Methyl ethyl ketone. 
Methyl propyl ketone. 
238 
376 
302 
383 
(69) 
81 
Formic acid. 
160 
77 
Acetic acid. 
237 
87 
Propionic acid. 
324 
Butyric acid. 
397 
Acetic anliydride. 
394 
(74) 
Propionic anhydride. 
642 
Benzene . 
314 
82 
Toluene . 
396 
79 
Ethyl benzene. 
475 
Difference. 
(77) 
It is evident from the above table that in all homologous series CHo exerts an 
effect on the molecular viscosity-work which is approximately constant and is about 
80 units, although, as in the case of molecular viscosity, there is a tendency for the 
value to diminish as the series is ascended. 
