THE FLUIDITY OF SOLUTIONS

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always higher than that of the chlorides and that of the chlorides
is always higher than the fluidity of the corresponding sulphate.
The ratio of nitrate to chloride is 1.02 and of nitrate to sulphate
1.14. We may also compare the salts of different metals joined
to the same acid radical and thus get a ratio in terms of one
metal taken for reference, as potassium. Considering the com-
plex effects due to dissociation, hydration and perhaps other
causes, the presence of even imperfect relationships of this kind
is remarkable.