356 THE ATOMIC WEIGHTS. 



In 1865 Delafontaine* published some results obtained from yttrium 

 sulphate, the yttrium being thrown down as oxalate and weighed as 

 oxide. In the fourth column I give the percentages of Yt^Og reckoned 

 from the anhydrous sulphate: 



In another paper f Delafontaine gives the following percentages of 

 Yt.^Og in dry sulphate. The mode of estimation was the same as before : 



48.23 

 48.09 



48.37 



Mean, 48.23, ± .055 



Bahr and Bunsen, % ''^iid likewise Cleve, ado]ited the method of con- 

 verting dry yttrium oxide into anhydrous sul})hate, and noting the gain 

 in weight. Bahr and Bunsen give us the two following results. I add 

 the usual percentage column : 



Yt.,0^. Vt.,{S0^)3. Percent. Yt.fi.^. 



.7266 grm. 1.4737 grm. 49-304 



.7856 " 1.5956 " 49.235 



Mean, 49.2695, ± .0233 



Clove's first results are published in a joint memoir by Cleveland 

 Hoeglund,§ and are as follows : 



Yt.p^. Yt.,{SO^)^. Percent. Yt^O-^. 



1.4060 grm. 2.8925 grm. 48. 60S 



1.0930 " 2.2515 " 48.545 



1.4540 " 2.9895 '■ 48.637 



1.3285 " 2.7320 " 48.627 



2.3500 " 4-8330 " 48.624 



2.5780 '• 5.3055 " 48.591 



Mean, 48.605, zfc .0096 



In a later paper Cleve || gives syntheses of yttrium sul[)hate made with 

 yttria, which was carefully freed from terbia. The weights and percent- 

 ages are as follow^s : 



*Ann. Chem. Pharm., 134, 108. 1865. 



+ Arch. Sci. Phys. et Nat. (2), 25, 119. 1866. 



X Ann. Chem. Pharm., 137, 21. 1866. 



I K. Svenska Vet. Akad. Handlingar, Bd. i, No. 8. 1873. 



II K. Svenska Vet. Akad. Handlingar, No. 9, 1S82. See also Bull. Soc. Chim., 39, 120. 1SS3. 



