G98 
MESSRS. T. E. THORPE AND J. W. RODGER ON THE RELATIONS 
Corresponding Compounds. 
Iodide. 
Bromide. 
Chloride. 
Acid. 
Alcohol. 
t'. 
Diff. 
t'. 
Diff. 
t'. 
Diff. 
t'. 
Diff. 
1 
t'. 1 
]\Iethyl . . 
42-9 
o 
o 
O 
o 
o 
-95-8 
o 
1.38-7 
-33-6 
1 
i 
iQh 1 
Ethyl 
61-5 
.34-6 
28-9 
-61-4 
122-9 
Propyl . . 
83-6 
28-9 
547 
28-3 
26-4 
-33-1 
116-7 
Butyl 
• • 
• • 
• • 
• • 
138-3 
Isopropyl . 
79-9 
28-3 
51-6 
30-2 
21-4 
Isobutyl 
97-6 
21-0 
76-6 
26-4 
50-2 
-31-5 
129-1 
Allyl. . . 
82-0 
31-2 
50-8 
30-5 
20-3 
Ethylene 
• • 
147-8 
(27-0) 
93.7 
In the case of simply constituted liquids, the same alteration in molecular weight 
brings about approximately the same alteration in temperature. The compound of 
highest molecular weight has also the highest temperature. The complex liquids— 
methyl alcohol and the acids—do not obey these rules, but give large negative diffe¬ 
rences which, in the case of the acids, diminish with rise in molecular weight. 
Normal Propyl and Allyl Compounds. 
Normal propyl. 
Differ-ence. 
Ally]. 
t’. 
t'. 
o 
o 
o 
Hydrocarbons. 
20-5 
(5-4) 
9-7 
Iodides . 
83-6 
1-6 
82-0 
Bromides. 
54-7 
3-9 
50-8 
Chlorides. 
26-4 
6-1 
20-3 
Ethylene and Acetylene 
Bromides. 
Ethylene. 
Acetylene. 
1 -v • ^ 
t'. 
lJlti6rGIlC6. 
t'. 
Bromide. 
147-8 
o 
44‘8 
103-0 
A normal propyl compound has invariably a slightly higher temperature than the 
corresponding allyl compound. The differences thus obtamed, unlike what holds for 
the differences in the viscosity magnitudes at equal slope, show no agreement with 
that given by the dibromides. 
