between the viscosity op liquids and their chemical nature. 647 
Molecular Viscosity at Slope •0^328 —(continued). 
1 
i 
i 
Observed. 
Calculated. 
Difference 
per cent. 
Dimethyl ketone. 
572 
558 
2-4 
' ilethyl ethyl ketone .... 
671 
678 
- 10 
Methyl propyl ketone.... 
796 
798 
- 0-2 ' 
‘ Diethyl ketone. 
i 
785 
798 
- 1-6 
I Acetaldehyde. 
448 
438 
2-2 
Formic acid. 
456 
484 
- 6-1 
Acetic acid. 
593 
604 
- 1-8 
Propionic acid. 
742 
724 
2-4 
* Batyric acid. 
842 
844 
- 0-2 
Isobutyric acid. 
843 
823 
2-4 
Acetic anhydride. 
838 
845 
- 0-8 
Propionic anhydride .... 
1036 
1085 
- 4-7 
Ethyl ether. 
635 
627 
1-3 
' 
Benzene . 
688 
697 
- 1-3 
Toluene. 
821 
814 
0-8 
Ethyl benzene. 
939 
934 
0-5 
Ortho-xylene. 
954 
934 
2-1 
Meta-xylene. 
939 
934 
0-5 
Para-xylene. 
i 
923 
934 
- 1-2 
The fifty-one compounds named, in the above table give an average divergence from 
the calculated values of about one per cent. (1‘13 per cent.). It is also significant 
that the largest differences are given by methyl iodide, acetone, aldehyde, and formic 
acid, which are all the initial members of homologous series. The large difference 
given by propionic anhydride, as already indicated, is probably due to impurity. 
In the following table are given the observed values of those substances which 
could not be included in deducing the fundamental constants and the values calculated 
for these substances after making certain assumptions as to their structure. 
