A System of Logic

John Stuart Mill

Book 5, Chapter 7, Footnote #03
Reality (different atomic weights) sinks in

No longer even a probable hypothesis, since the establishment of the atomic theory; it being now certain that the integral particles of different substances gravitate unequally. It is true that these particles though real minima for the purposes of chemical combination, may not be the ultimate particles of the substance; and this doubt alone renders the hypothesis admissible, even as an hypothesis.

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Sol, Book 5, Chapter 7 Fallacies of Confusion.