Ts had arrived at several very important generalisations respec

Elation was established
between the hypothetical units and heat. The phenomena of electrolytic decomposition showed that there was a like close relation between these
units and electricity. The quantity of electricity generated by the combination of any two units is sufficient to separate any other two which are susceptible of such decomposition. The phenomena of isomorphism showed a relation between the
units and crystalline forms; certain units are thus able to replace others
in a crystalline
body without altering its form, and others are not. Again, the laws of the effect
of pressure and heat on gaseous bodies, the fact that they combine in definite proportions by volume, and that such proportion bears a simple relation to their combining weights, all harmonised
with the
Daltonian hypothesis, and led to the bold speculation known as the law of Avogadro--that all gaseous bodies, under the same physical
conditions, contain the same number of units. In the form in which it was first enunciated, this hypothesis
was incorrect--perhaps it is not exactly true in any form;

but it is hardly too much to say that chemistry and molecular physics would

never have advanced to their present
condition unless it had been assumed to be true. Another immense
service rendered by Dalton, as a corollary of the new atomic doctrine, was the creation of a system of symbolic notation, which not only made the nature of chemical compounds and processes easily intelligible and easy

of recollection, but, by its very form, suggested new lines

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