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Avogadro, Amedeo M. Gay-Lussac has shown in an interesting Memoir that gases always unite in a very simple proportion by volume, and that when the results of the union is a gas, its volume also is very simply related to those (volumes) of its components. But the proportions of weight of substances in compounds only seem to depend on the relative number of molecules which combine, and on the number of compound molecules which result. It must then be admitted that very simple relations also exist between the volumes of gaseous substances and the numbers of simple or compound molecules which form from them. The first hypothesis to present itself in this connection, and apparently even the only admissible one, is the supposition that the number of integral molecules in any gas is always the same for equal volumes, or always proportional to the volumes.