46 THE ATOMIC WEIGHTS. 



have reduced both series to one standard ; namely, so as to 

 express the number of parts of nitrate corresponding to 100 

 of chloride : 



These figures by Stas represent weighings in the air. Re- 

 duced to a vacuum standard this mean really becomes 

 135.6423. 



Now, combining, we have : 



Penny, ist series 135.636, zh .0011 



" 2cl " 135-633. ± -001 1 



Stas 135.6423, ±_ .0014 



General mean 135-6363, zb .0007 



Aronstein's Translation, p. 270. 



