NOTES ON ATOMIC WEIGHTS. 213 



heating a mixture of potassium chlorate and ferric oxide, 

 and the hydrogen from a solution of caustic potash by the 

 action of metallic aluminium. The values found were : — 



Weight of one litre of oxygen at 0° C. and 760 mm. pressure, at 

 sea-level in Latitude 45° - - - = 1*42906 grams. 

 And of hydrogen similarly = -089947 gram. 



From these he deduces the ratio of the volumes in which 

 they must combine to form water to be 1 : 2*00237. 



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