490 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 54 



In a later paper Cleve ' gives syntheses of yttrium sulphate made with 

 yttria which was carefully freed from terl)ia. The weights and per- 

 centages are as follows : 



Mean, 48.503, ± .0029 



Hence Yt = 89.12. 



The yttria studied hy Jones " had been purified by Eowland's method — 

 that is, l)y precipitation with potassium ferrocyanide — and certainly con- 

 tained less than one-half of one per cent, of other rare earths as possible 

 impurities. Two series of determinations were made — one by ignition of 

 the sulphate, the other by its synthesis. The results were as follows, with 

 the usual percentage column added : 



' K. Svenska Vet. Akad. Hanrllingar, No. 9, 1S82. See also BuH. Soc. Chim., 39, 120. 1883. 

 = Amer. Chem. Journ., 17, 154. 1895. 



