OXYGEN. 31 



.24297 



243Q3 

 .24286 

 .24271 

 .24283 

 .24260 



243*4 

 .24294 



Mean, 1.24289, .00004 



The weight of hydrogen evolved from one gramme of aluminum was 

 found in Thomsen's gravimetric research to be 0.11190, zb .000015. 

 Hence the weight of one litre at 0, 760 mm., and 10.6 meters above sea 

 level at Copenhagen is : 



.090032, .000012; 



or at sea level in latitude 45, 



.089947, dh .000012 gramme. 



The data for oxygen are given in somewhat different form, namely, 

 for the volume of one gramme of the gas at 0, 760, and at Copenhagen. 

 The values are. in litres : 



.69902 



.69923 



.69912 



.69917 



.69903 



.69900 



.69901 



.69921 



.69901 



.69922 



Mean, .69910, .00002 

 At sea level in latitude 45, .69976, .00002 



Hence one litre weighs 1.42906, .00004 grammes. 



Dividing this by the weight found for hydrogen, 0.089947, .000012 

 we have for the ratio H : 0, 



15.8878, .0022. 



The density ratios, H : 0, now combine as follows : 



Dumas and Boussingault, corrected 15.9015, d= .031 



Regnault, corrected 15.9105, =b .0044 



Rayleigh, 1888 15.884, .0048 



" 1892 15.882, .0023 



Cooke , 15.890, .0067 



Leduc i5-95 - OI 54 



Morley, including all the data ., . . 15.8955, .0005 



Thomsen 15.8878, .0022 



General mean 15.8948, =h .00048 



