330 Democritus, Greek philosopher, develops Atomic theory, believes cause and necessity, nothing comes out of nothing.
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Joseph Proust's law of definite proportions and John Dalton's atomic theory branched from the discoveries of Antoine Lavoisier.
It was named after Dr. John Dalton (1766–1844), an English scientist who contributed to the foundations of atomic theory.
At the centennial of John Dalton’s atomic theory held at Manchester, England in 1903, Clarke delivered the Wilde Lecture.