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On the 10th of June 1875 he died in Dalton, Georgia, a city which in 1848 he had helped to found.
Dalton believed that the molecules of the elementary gases consisted each of one atom; his diagram for hydrogen gas makes the point clear.
The "symbols" for the elements used by Dalton, apparently suggested by those of the alchemists, have been rejected in favour of those which were introduced by Berzelius.
Following Newton, he believed a gas to be made up of particles or atoms, From Dalton's Hydrogen Gas.
He drew simple diagrams, three of which, taken from Dalton's New System of Chemical Philosophy, part ii.