228 THE ATOMIC WEIGHTS. 



1. From tartar emetic, ratio (6) Sb = 118.024, .2827 



2. From SbBr 3 " = 119.005, d= .0212 



3. From SbI 3 , ratio (i i ) "= 119.037, .1626 



4. From Sb 2 S 3 , ratio (i) " = 119.548, .0069 



5. From ratio (14) " = 119.737, .0188 



6. From ratio (13) " = 120.342, .0384 



7. From ratio (4) " = 121.155, .1000 



8. From SbCl 3 " =. 121.387, .0321 



9. From ratio (5) " 121.408, .0891 



10. From ratio (12) " = 121.434, .0078 



11. From Sb 2 O 4 , ratio (2) u = 121.542, .0546 



General mean Sb = 120.299, zb .0047 



If = 16, this becomes Sb = 121.218. 



Among these figures the discordance is so great that the mathematical 

 combination has no real value. We must base our judgment in this case 

 mainly upon chemical evidence, and this, as shown in the investigations 

 of Cooke and of Schneider, favors a lower rather than a higher value for 

 the atomic weight of antimony. Dumas' work was affected by constant 

 errors which are now known, and Dexter's data are also presumably in 

 the wrong. A general mean of values 2, 3, 4, and 5 gives Sb = 119.521, 

 .0062, or, if = 16, Sb = 120.432. Even now the range of uncertainty 

 is greater than it should be, but none of the four values combined can 

 be accepted exclusively or rejected without more evidence. This result, 

 therefore, should be adopted until new determinations, of a more con- 

 clusive nature, have been made. 



