116 



L. F. Nilson, 



3. Neutral: Zr.0 4 .2SeO. 



After digesting the basic salt in 13 mol. anhydride of selenious acid 

 and water at 60°, there was obtained a well crystallized compound in mi- 

 croscopical, oblique, four-sided prisms. After heating to whiteness, the 

 zirconia remained crystallized in the same form as the selenite. 



Analysis: 



0.432 gr. salt, heated to whiteness, aftorded O.1547 gr. zirconia. 

 In 100 parts: 



found calculated 



Zirconia 35.81 ZrO 2 122 35.47 



Selenious acid .... 64.19 2SeO' J 222 64.53 



100.00 344 100.00 



Zirconium seems consequently able to form no acid selenite and 

 differs therein from thorium, nor has any analogy with this element been 

 found in the 



SELENITES OF TIN. 

 1. 3 A -Selenite: Sn 5 1,; .6SeO + 27H 2 0. 



A solution of neutral tetrachloride of tin, on adding selenite of so- 

 dium, gave a white voluminous precipitate, which in the microscope showed 

 traces of crystallization. 



Analyses: 



1) O.G04 gr. salt gave 0.148 gr. selenium or 0.2079 gr. selenious acid. 



2) 0.601 gr. salt gave 0.1477 gr. selenium or 0.2075 gr. selenious acid. 



3) 0.609 gr. salt after heating gave a residue of 0.2445 gr. dioxide of tin. 



4) 0.628 gr. salt gave likewise 0.252 gr. dioxide of tin. 



5) 0.3765 gr. salt, when dried at 100°, diminished in the weight by 0.0815 gr. 



Calculated on 100 parts: 



experiment theory 



1. 2. 3. 4. 5. 



Oxide of tin ... — — 40.15 40.13 — 5Sn0 2 750 39.43 



Selenious acid .. 34.42 34.52 — — — 6Se0 2 666 35.01 



Water — — — — 21.65 27H 2 486 25.56 



1902 100.00 



