ZIRCONIUM. 213 



parts of salt; B, the K0SO4 from 100 parts of salt; and C, 

 the ZrO, proportional to 100 parts of K2SO4 : 



A. B. C. 



43.100 61.300 70.310 



43.200 61.600 70.130 



43.119 61.000 70-677 



43.380 61.560 70.468 



Mean, 43.200, =t .043 61.365, d= .094 70.396, ± .079 



From A 21=89.775,^.216 



" B " = 91.408, it .437 



" C " = 90.476, dr .138 



General mean " = 90.328, ± -113 



Or, if = 16, Zr = 90.536. 



Combining with Berzelius' work we get this result : 



Berzelius Zr = 89.255, ± .039 



Marignac " = 90.328, ± .113 



General mean " = 89.367, zh .037 



Or, if O = 16, Zr = 89.573. 



These figures need little criticism. They show conclu- 

 sively that the atomic weight of zirconium ought to be 

 redetermined. Probably the method employed by Berze- 

 lius was the best with respect to manipulation, while on 

 the other hand it is likely that Marignac worked with 

 purer material. Hermann's experiments could hardly have 

 yielded certain results, since the zirconium chloride might 

 so easily become contaminated with traces of moisture and 

 thence of oxygen. 



