RICHARDS. — ATOMIC WEIGHT OF STRONTIUM. 



389 



Ratio of Strontic and Argentic Bromides 



First Series. 



It remains only to bring together the results into one table. 



Final Averages 

 Oxygen =16.000 



strontium equals 



87.644 

 87.663 

 87.668 

 87.660 

 87.659 



= 87.659 

 Average, rejecting I. above = 87.663 



The last average is probably most nearly correct. 



The analysis of strontic chloride has already been begun, and the 

 preliminary results indicate that the results given above are certainly 

 not too high. For the present, then, the atomic weight of strontium 

 may be taken as 87.66 if oxygen is 16.00, 87.44 if oxygen is 15.96, 

 and 87.01 if oxygen is 15.88. 



