ZIRCONIUM. 137 



of acid driven off by heat, the residue weighed, the 

 potassic sulphate leached out with water, and the residue 

 again weighed. Marignac does not pretend that the deter- 

 mination is accurate. The results gave from 45.01 to 45.48. 

 He thinks that some potassic sulphate may have escaped 

 solution, and therefore takes the minimum. K = 39, S = 

 16. 



According to Marignac, Deville also found the atomic 

 weight of zirconium somewhat higher than Berzelius by 

 analysis of the chloride with which he determined the 

 vapor density. {Annal. de Chim. et de Phys., (S,) 60, 18Q0, 

 257.) 



