114 



L. F. Nilson, 



3. 8 / 3 -Selenite: Th.O\2SeO + 3H 2 .0 2 .Se04-5H 2 0. 



The neutral selenite of thorium, treated with 6 mol. or 105-36 pr. 

 ct. anhydride of selenious acid under the above circumstances, gave a residue 

 which seemed to have undergone no change in appearance. 



Analyses: 



1) 0.0 gr. salt gave 0.2467 gr. selenium or 0.3466 gr. selenious acid and 

 0. 167 gi\ oxide of thorium, after heating to whiteness with carbonate of 

 ammonium. 



2) 0.781 gr- salt gave 0.3212 gr. selenium or 0.4513 gr. selenious acid 

 and 0.2167 gr. oxide of thorium. 



In 100 parts: 



found calculated 



1. 2. 



Oxide of thorium. . . 27.83 27.75 ThO 2 266 27.57 



Selenious acid .... 57.78 57.78 5Se0 2 555 57.51 



Water (loss) 14.39 14.47 8H 2 144 14.92 



100.00 100.00 965 100.00 



These in composition extraordinary selenites are in such a relation 

 one to another that the acid salt, mentioned under 2, may be regarded as 

 a sum of the two others, the amount of water unchanged: 



™ 7S eo. +1 e ff oH™:: 8 8H:°o. 



SELENITES OF ZIRCONIUM. 

 i. % -Selenite: Zr 4 .O u .3Se04- 18H 2 0. 



A solution of oxy-chloride of zirconium precipitated with selenite of 

 sodium, yielded a white, slimy, amorphous, basic salt, not at all soluble in 

 water and only with difficulty in hydrochloric acid. 



Analyses: 



1) 0.5775 gr. salt gave 0.119 gr. selenium or 0.1672 gr. selenious acid and 

 0.248 gr. zirconia, after heating to whiteness with carbonate of ammonium. 



