Samarium. 21 



Spec. Grav. of the crystallised salt: 



1.4475 gram, crystals, t" 18" sp. Gr. 3.541 

 1.4284 » » » 10" » » 3.â66 



Mean of both determinations : 3.553. 



Molecular volume: 148.9. 



Spec. Grav. of the anhj'drous salt: 



1.3838 gram, t" 10° sp. Gr. 4.129 



1.2551 » » » » » 4.098 

 Mean of both determinations: 4.ii3. 

 Molecular volume: 115.5. 



Selenate of samarium and ammonium 



SmNH,2SeO, + 3H,0. 



By spontaneous evaporation of the mixed solutions of selenate of 

 samarium and of ammonium, the latter in excess, small, topas-yellow 

 tablets grouped together into hemisphserical masses are obtained. 



I. a. 1.0704 gram lost by 210" 0.ii32 gram HjO and gave 0.3298 

 gram Se and 0.3644 gram SmgOj; 



b. 3.0306 gram lost by 210" 0.3248 gram HjO. 



c. 0.8643 gram gave 0.2670 gram Se and 0.2952 gram SmjOj.' 



II. 0.4796 gram lost by 220" 0.0521 gram HjO and gave 0.1479 

 gram Se and 0.162 gram Sm^Og. 



In percent: 



I. a b c II. Oalc 



Sm.Og 34.04 — 34.15 33.78 348 34.25 



SeÔg 49.53 — 49.66 49.58 508 50.00 



(NH,);0 (5.85) — — (5.78) 52 5.12 



HjO 10.58 10.72 — 10.86 108 10.63 



1016 100.00 



Spec. Grav. of the crystallised salt: 



L 1.1411 gram, crystals, t" 14" sp. Gr. 3.277 



1.6452 » » » 15" » » 3.263 



II. 0.7559 » » » 18".6 » » 3.260 



