YTTRIUM. 357 



yt. 2 O 3 . y/ 2 (S0 4 ) 3 . Percent. Yt. t O z . 



.8786 1.8113 48/507 



.8363 .7234 48.526 



.8906 .8364 48.497 



.7102 .4645 48.494 



.7372 .5194 48.519 



.9724 .0047 48.506 



.9308 .9197 48.487 



.8341 .7204 48.483 



1.0224 2.1073 48.5*7 



.9384 i.934i 48.519 



9744 2.0093 48.494 



1.53*4 3.1586 48.484 



Mean, 48.503, .0029 



Hence Yt = 88.449. 



The y ttria studied by Jones* had been purified by Rowland's method- 

 thai is, by 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 : 



First Series. Syntheses. 



* Anier. Chem. Journ., 17, 154. 1895. 



