88 



L. F. Nilson, 



in cold or in heat, but in a concentrated state unites with it, as will be 

 proved by the following. 



Analyses: 



1) 0.5219 gr. salt gave 0.1556 gr. selenium or 0.2186 gr. selenious acid 

 and 0.3093 gr. waterfree sulphate of yttrium, containing 0. 1504 gr. yttria. 



2) 0.4404 gr. salt gave 0.132 gr. selenium or 0.1855 gr. selenious acid 

 and 0.2635 gr. sulphate of yttrium, corresponding to 0.128 gr. yttria. 



Centesimally represented : 



found calculated 



1. 2. 



Yttria 28.81 29.08 Y 2 3 227 1 ) 29.26 



Selenious acid 41.89 42. n 3Se0 2 333 42.91 



Water (loss) 29.30 28.81 12H 2 216 27.83 



100.00 100.00 776 100.00 



2. Vs-Selenite: Y 2 .0 6 .3SeO 4-H 2 .0 2 .SeO + 3H 2 0. 



When the preceding salt with 42.91 pr. ct. selenious anhydride in 

 an aqueous solution was evaporated to dryness at 60°, and the rest was 

 treated with water, there was obtained a microscopically crystalline, in- 

 soluble salt, a considerable quantity of selenious acid remaining in the solution. 



An aly ses: 



1) 0.4235 gr. salt gave 0.176 gr. selenium or 0.2473 gr. selenious acid and 

 0.26 gr. sulphate of yttrium, corresponding to 0.1264 gr. yttria. 



2) 0.327 gr. salt gave 0.1365 gr. selenium or 0.1918 gr. selenious acid 

 and 0.2015 gr. sulphate of yttrium or 0.098 gr. yttria. 



Centesimally represented : 



found calculated 



1. 2. 



Yttria 29.85 29.95 Y 2 3 227 30.55 



Selenious acid .... 58.39 58.65 4Se0 2 444 59.76 



Water (loss) 11.76 11.40 4H 2 72 9.69 



100.00 100.00 743 100.00 



•) The atomic weights for the rare earth-metals are here employed in accor- 

 dance with Cleve's recent determinations. 



