ATOMIC WEIGHTS 13 



Means 1253.3 1251.5 



In the sum total of these nineteen experiments, 840.161 grammes of 

 oxygen form 945.439 grammes of water. This gives, in percentages, for 

 the composition of water — oxygen, 88.864; hydrogen, 11.136. Hence 

 the ratio H : 0, calculated in mass, is 1 : 15.9608. In the following column 

 the values are deduced from the individual data given under the headings 

 F and G : 



15.994 



16.014 



16.024 



15.992 



15.916 



15.916 



15.943 



16.000 



15.892 



15.995 



15.984 



15.958 



15.902 



15.987 



15.926 



15.992 



15.904 



15.900 



16.015 



Mean, 15.9607, ± .0070 



In calculating the above column several discrepancies were noted, 

 probably due to misprints in the original memoir. On comparing col- 

 umns B and C with F, or D and E with Gr, these anomalies chiefly appear. 

 They were detected and carefully considered in the course of m)- own 

 calculations; and, I believe, eliminated from the final result. 

 2 



