Volumetric analysis

   Johhn Dalton was English meteorologist who switched to chemistry when he saw the applications for of his ideas about the atmosphere. He proposed the Atomic Theory in 1803 which stated that 1 all matter was composed of small indivsible particles termed atoms, 2 atoms of a given elements, possess unique characteristics and weight, and 3 three types of atoms exist. Simple compound, and complex. Dalton's theory was presented in New System of Chemical Philosophy (1808-1827). This work identified chemical affinities. 

  Instead, Dalton inferred proportions of elements on compounds by taking ratios of the weights of reactants, setting the atomic weight of hydrogen to be identically one.Bold text