456 



Lord Rayleigk. On the 

 Oxygen. 



[Feb. 18, 



The six fillings were all independent, except that of July 6, when 

 the bulk of the oxygen remaining from the previous filling was not 

 removed. It so happens that this case shows the greatest dis- 

 crepancy, but there seems to be no sufficient reason for rejecting it. 



Hydrogen. 



Hydrogen. 



