SILVER, POTASSIUM, ETC. 66 



six different sources, found of sodium chloride equivalent 

 to 100 parts of silver : 



^ 54-2093 



54.2088 

 54.2070 

 54.2070 

 54.2070 

 54.2060 

 54.2076 

 54.2081 

 54.2083 

 54.2089 



Mean, 54.2078, ± .0002 



Now, combining these three series, we get the following 

 result : 



Pelouze 54.141, ±.0063 



Dumas 54.172, d= .0096 



Stas 54.2078, ± .0002 



General mean 54.2076, ± .0002 



Here the work of Stas is of such superior excellence that 

 the other series might be completely rejected without ap- 

 preciably affecting our calculations. 



We have now before us the data establishing, with greater 

 or less accuracy, twenty different ratios relating to the 

 atomic weights of the seven elements under discussion. In 

 these we are to discuss the results of about two hundred and 

 fifty separate experiments. Before beginning upon our cal- 

 culations we will tabulate our ratios, and number them for 

 convenient future reference. Of course it will be under- 

 stood that the probable errors given below relate to the last 

 term of each proportion : 



(l.) Percentage of O in KCIO;, 39.154, dr .00038 



(2.) " " KBrOj 28.6755, ± .0207 



(3.) " " KIO3 22.473, ± .0050 



(4.) " " NaClOg 45.0705,^.0029 



(5-) " " AgClOj 25.0795, ±: .0010 



(6.) " " AgBrO^ 20.349, ±.0014 



(7.) " " AglO.j 16.9771, ± .0009 



(8.) " Ag in AgjSO^ 69.205, ±.0011 



