632 MESSRS. T. E. THORPE AND J. W. RODGER ON THE RELATIONS 
the atomic chain influence the magnitudes of the coefficients. Similar effects of 
constitution are also exhibited on comparing saturated and unsaturated hydrocarbons, 
and the variable effects produced by successive substitution of halogen for hydrogen. 
7. The alcohols, and to some extent the acids, still give results which are peculiar 
when compared with those of the other substances. 
Molecular Viscosity (ly x specific molecular area = in dynes per 
SQ. CENTIM. X 10^ AT SLOPE 04323. 
[r] in dynes per sq. centim. X specific molecular area in sq. centims. X fOh) 
Homologues. 
j 
7/cZ2. 
Diffei’ence. 
Pentane . 
687 
131 
Hexane. 
818 
113 
Heptane. 
9.31. 
104 
Octane. 
1035 
Isopentane . 
6C.3 
1.36 
Isohexane . 
799 
109 
Isolieptane. 
908 
Isoprene . 
620 
108 
Diallyl. 
728 
i 
Metliyl iodide. 
638 
140 
Ethyl iodide. 
778 
125 
Propyl iodide. 
j 
903 
Isopropyl iodide. 
878 
132 
Isohntyl iodide. 
1010 
Ethyl bromide. 
663 
111 
Propyl bromide. 
774 
Isopropyl bromide. 
750 
127 
Isobutyl bromide. 
877 
Ethylene bromide. 
973 
95 
Propylene bromide. 
1068 
1 
