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Atomic Theory
That all elemental bodies consist of aggregations of atoms, not
united fortuitously, but according to fixed proportions. The four laws
of Dalton are—constant proportion, reciprocal proportion, multiple
proportion, and compound proportion.
This has nothing to do with the atomic theory of Leucippus. It merely
means that gases and other elements always combine in certain known
ratios or units.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894 More on Atomic Theory from Infoplease:
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