412 Dr. Thomas Thomson and Dr . Steels [June 



No bisulphate of yttria could be formed. When we eva- 

 porate a solution, containing even a considerable excess of 

 acid, common sulphate of yttria is obtained. 



2. Acetate of yttria. — This salt crystallizes in beautiful 

 rhombs. It has a sweet taste and is not altered by expo- 

 sure to the air. 



10*58 grains of the crystals heated on the sand-bath, fell 

 to a white powder and lost 2*14 grains. After ignition, 

 the yttria remaining weighed 3*92 grains. Hence, its con- 

 stituents are, 



Yttria . . . 3*92 or 5*5 

 Acetic acid. . 4-52 „ 6*341 

 Water ... 2-14 „ 3000 



10-58 



In a second analysis, 9*2 grains lost on the sand-bath 

 2-05 grs., and after ignition there remained 3*35 grs. of 

 yttria. Hence, it was composed of, 



Yttria .... 338 or 5*5 

 Acetic acid . . 3*80 „ 6*238 

 Water .... 2*05 „ 3*365 



9*2 

 These analyses shew that the salt is composed of 

 1 atom yttria .... 5*5 

 1 atom acetic acid . . . 6*25 

 3 atoms water .... 3*375 



3. Oxalate of yttria. — Oxalic acid seems to combine in 

 various proportions with yttria. The oxalates, however, 

 have all the same beautiful snow-white colour. They 

 appear to be quite insoluble in water ; but after being once 

 or twice washed on a filter, the liquid begins to pass 

 through muddy. 



1st. 11*38 grs. of anhydrous sulphate of yttria gave by 

 oxalate of ammonia, 12*9 grs. of oxalate of yttria, which, 

 when ignited, left 5*97 grs. of yttria. 



2nd. 10 grs. of yttria dissolved in muriatic acid gave 22*4 

 grs. of oxalate of yttria. 



3d. 30*04 grs. of oxalate of yttria, dried as well as pos- 

 sible, left, after ignition, 12*422 grs. of yttria. 



