BETWEEN THE VISCOSITY OF LIQUIDS AND THEIR CHEMICAL NATURE. 641 
Values of Bromine. 
1 
Bz’omide. 
“ Rest ” 
(calculated). 
Br. 
(observed). 
Ethyl. 
663 
284 
379 
1 Propyl . 
774 
404 
370 
Isopropyl . 
750 
383 
367 
Isobutyl . 
877 
503 
374 
Allyl. 
734 
363 
371 
Ethylene. 
973 
240 
(367) 
Propylene. 
1068 
360 
(354) 
1 Isobutylene. 
1171 
459 
(356) 
1 Acetylene. 
932 
199 
(367) 
In monobalogen compounds bromine has thus the value of 372, the mean divergence 
from this value being about 3. 
In dihalogen compounds, however, bromine would appear to liave a slightly lower 
value, viz., 361, with a mean divergence of 6. 
Values of Chlorine. 
Chloride. 
“ Rest ” 
(calculated). 
Cl. 
Yjdr (observed). 
Propyl. 
6.58 
404 
254 
Isopropyl . 
644 
■383 
261 
Isobutyl. 
760 
503 
257 
Allyl. 
617 
363 
254 
Ethylene. 
737 
240 
(248) 
Methylene. 
600 
120 
(240) 
Chloroform. 
747 
76 
(224) 
[ Carbon tetrachloride .... 
854 
31 
(206) 
' Cai'bon dicbloricle ..... 
i 
1032 
110 
(2.30) 
In saturated as well as unsaturated monohalogen compounds chlorine seems to 
have the value 256, the mean divergence being about 2 units. 
For the two dihalogen compounds the number obtained is 244 ; from the trihalogen 
compound it is 224, and from the tetrahalogen compound 206 ; the value which may 
thus be ascribed to chlorine becomes less and less as chlorine accumulates in the mole¬ 
cule. In the unsaturated tetrahalogen compound, using the ordinary values of C and 
of a double linkage, the number obtained is 230, which is nearer that deduced from 
chloroform than from carbon tetrachloride, and is the same as the value (231) given 
by ethyhdene chloride. 
mdcccxciv.—A. 4 N 
