RATIO O ! H. 255 



Hence, let us see what the extremes teach us 

 Oxygen, highest, 1429.6 mgr. 



Hydrogen, lowest, 89.78 " 



giving the ratio O : H = 15-923 



and for O= 16 exactly, H = 1.0048. 



Oxygen, lowest, 1428.3 mgr. 



Hydrogen, highest, 90.14 " 



giving the ratio O : H 15.846 



and for O = 16 exactly, H = 1.0098. 



The actual determinations by Morley, therefore, range 

 as follows : 



Atomic Weight 



For Oxygen. Ratio O : H. H, for O = 16. 



Absolute lowest, 15.846 1.0098 



Mean, " 15.881 1.0075 



Mean of all, J 5-894 1.0067 



Mean highest, 15.902 1.0061 



Absolute highest, i59 2 3 1.0048 



This is the true expression of the actual determinations 

 made by Morley. 



We may here repeat the values obtained by Lord Ray- 

 leigh ; see p. 244. 



Hydrogen, for O = 16, exactly. 

 1893 1.0062 



1897 1.0028 



It seems to us that Morley has been doing reasonably 

 well ; if he only had kept up his practice, he might again 

 have halved his smallest value and come up to the level of 

 Lord Rayleigh, in 1897. 



Within the range of Morley's determinations of the 

 weights of a liter of oxygen and of hydrogen, he has 

 obtained results ranging 



for H, from 1.0098 

 to 1.0048 



the excess above i having ranged from 98 to 48 ten-thou- 

 sandths, which is the same as from ten to five-thousandths. 

 How much longer would he have had to practice, to drop 

 the other half of his original excess? 



