94 



L. F. Nilson, 



In 100 parts: 



found 



calculated 



Oxide of cerium . . 30.22 

 Selenious acid ... 61.60 

 Water (loss) .... 8.18 



Ce 2 3 324 30.00 

 6Se0 2 6G6 61.67 

 5H 2 90 8.33 



100.00 



1080 100.00 



This salt is quite analogous in composition to the above-mentioned 

 salt of aluminium 



A solution of sulphate of lanthanum, on adding excess of selenite of 

 sodium, yielded a white, insoluble, completely amorphous precipitate. 



1) O.5735 gr. salt gave 0.1562 gr. selenium or 0.2195 gr. selenious acid 

 and 0.4015 gr. sulphate of lanthanum, which at a white heat, carbonate 

 of ammonium being added, gave the calculated quantity of oxide of 

 lanthanum or 0.2313 gr. 



2) 0.473 gr. salt gave 0.1308 gr. selenium or 0.1838 gr. selenious acid 

 and . 3355 gr. sulphate of lanthanum, which, after heating to whiteness 

 with carbonate of ammonium, gave 0.1935 gr. oxide of lanthanum, the 

 calculated quantity being 0.1932 gr. 



Al 2 .0 G .3SeO + 3H 2 .0 2 .SeO + 2H 2 0, 



also formed under the same circumstances. 



SELENITES OF LANTHANUM. 



l. 8 / 9 -Selenite: La 6 .0 17 .8SeO + 28H 2 0. 



Analyses: 



Centesimally represented: 



calculated 



Oxide of lanthanum . 40.33 40.91 

 Selenious acid .... 38.27 38.86 

 Water (loss) 21.40 20.23 



3La 2 3 978 41.26 

 8Se0 2 888 37.47 

 28H 2 504 21.27 



100.00 100.00 



2370 100.00 



