10 p. T. Cleve, 



Spec. Grav: 

 0.7094 gram, small prisms, t° 2r\2 sp. Gr. 2.683 



1.0993 » large crushed prisms » » » 2.696 



Mean of both determinations: 2.689 

 Molecular volume: 288. 



Nitrate of didymium 



DiSNOs + eH^O. 



It was obtained, by slow evaporation over oil of vitriol, as a 

 mass of flat prisms which were not very deliquescent. 



0.7997 gram left by ignition 0.3959 gram B'^Os. 



In percent: 



Calc 



DisOs 38.25 166 38.G7 



N2O5 - 162 — 



H,0 — 108 — 



Spec. Grav: "*''*■" 



1.6799 gram, t" 19, sp. Gr. 2.245 

 1.6865 » » )) » 2.253 



Mean of both determinations: 2.249. 

 Molecular volume: 193.9. 



lodate of didymium 



Di3l03 + 6H20(2H20, dried at 100°). 



Iodic acid gives with the salts of didymium an amorphous, bulky, 

 and faintly violet precipitate which, after having been dried between 

 paper, loses on heating to 100° 9.90 percent HgO (calc 9.29). A portion 

 of the salt, dried at 100°, was analysed. 



I. 0.5056 gram was dissolved in water, containing sulphurous 

 acid, nitrate of silver added and the didymium precipitated after filte- 

 ring from the Agi, 0.5041 gram Agi and 0.1240 gram DijOg were thus 

 obtained. 



