BETWEEN THE VISCOSITY OF LIQUIDS AND THEIR CHEMICAL NATURE. 679 
Molecular Viscosity-work at Slope •0j987. 
Observed. 
Calculated. 
Difference 
per cent. 
Octane. 
III3 
1072 
3-7 
i 
Ethyl iodide. 
0.37 
646 
- 1-4 
Propyl iodide. 
794 
796 
- 0-2 
Isopropyl iodide. 
790 
781 
11 
Isobutyl iodide. 
924 
931 
- 0-8 
Allyl iodide. 
737 
745 
- 1-1 
Isobutyl bromide. 
841 
805 
4-3 
Ethylene bromide. 
821 
856 
- 4-3 
Propylene bromide. 
977 
1006 
- 2-9 
Isobutylene bi’omide .... 
1157 
1141 
1-4 
Acetylene bromide. 
747 
705 
5-6 
Ethylene chloride. 
603 
608 
- 0-8 
Methyl propyl ketone .... 
721 
714 
1-0 
Diethyl ketone. 
718 
714 
0-5 
Formic acid. 
301 
298 
1-0 
Acetic acid. 
462 
448 
30 
Propionic acid. 
610 
598 
2-0 
Butyric acid. 
766 
748 
2-3 
Isobutyric acid. 
764 
733 
4-1 
Acetic anhydride. 
731 
729 
0-2 
Propionic anhydride .... 
1006 
1029 
- 2-3 
Benzene . 
579 
.587 
- 1-4 
Toluene. 
740 
737 
0-4 
Ethyl benzene. 
900 
887 
1-4 
Ortho-xylene. 
895 
887 
0-9 
Meta-xylene. 
886 
887 
- 01 
Para-xylene. 
890 
887 
0-3 
In the above tables the agreement between observed and calculated values is prac¬ 
tically the same as at the smaller slope; the mean percentage difference is about 1‘8 
per cent. It is noticeable that in the case of the dibromides the differences are 
uniformly larger than in the case of the other liquids. 
It is also evident that although the relations between the isomeric chlorethanes are 
