MP]S8RS. T. E. THORPE AND J. W. RODGER ON THE RELATIONS 
(5 GO 
Value of Iodine. 
i 
Iodide. 
7 # (obsei’ved). 
“ Rest ” 
(calculated). 
1. 
Ivl ethyl. 
255 
46 
209 
Ethyl . 
:}4l 
126 
215 
Propyl . 
425 
206 
219 
Isoproi^yl. 
417 
198 
219 
Isobatyl. 
505 
278 
227 
1 Allyl. 
397 
179 
218 
Mean value of I = 218. 
The average divergence from the mean is less than 4, 
Values of Bromine. 
Bromide. 
(obsei’ved). 
“Rest” 
(calculated). 
Br. 
Ethyl . 
282 
, 126 
156 
Propyl . 
353 
206 
147 
Isoprojjyl. 
346 
198 
148 
Isobutyl . 
433 
278 
155 
Allyl. 
327 
179 
148 
Ethylene . 
450 
160 
(145) 
Propylene . 
526 
240 
(143) 
Isobutylene. 
614 
312 
(151) 
Acetylene. 
418 
113 
(152) 
In monohalogen compounds bromine has the value 151, the average divergence 
being less than 4. 
In dibromides the value for bromine is 148, with an average difference of less 
than 4. 
This value is almost the same as that in monobromides, but the small difference is 
probably real, as comparisons of molecular viscosity, and also of chlorine compounds, 
&c., serve to show that in dihalogen compounds the halogen has a lower value than 
in monohalogen compounds. 
