“Now it is one great object of this work, to shew the importance and advantage of ascertaining the relative weights of the ultimate particles, both of simple and compound bodies, the number of simple elementary particles which constitute one compound particle, and the number of less compound particles which enter into the formation of one more compound particle.”

—  John Dalton, book A New System of Chemical Philosophy

Source: A New System of Chemical Philosophy (1808), Ch. III. On Chemical Synthesis

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John Dalton6
English chemist, meteorologist and physicist 1766–1844

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