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 2 3 reckoned 

 from the anhydrous sulphate : 



Mean, 49.998, =b .081 



In another paper f Delafontaine gives the following percentages of 

 Yt. 2 3 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, J and likewise Cleve, adopted the method of con- 

 verting dry yttrium oxide into anhydrous sulphate, and noting the gain 

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

 the usual percentage column : 



Yt. 2 3 . Yt^SO^ Percent. F/ 2 6> 3 . 



.7266 grm. L4737 grm. 49.34 



.7856 " L5956 " 49-235 



Mean, 49.2695, .0233 



Cleve's first results are published in a joint memoir by Cleve and 

 Hoeglund, and are as follows : 



Percent. 



1. 4060 grm. 2. 8925 grm. 48.608 



1.0930 " 2.2515 " 48.545 



1.4540 " 2.9895 " 48.637 



1.3285 " 2.7320 " 48.627 



2.3500 " 4-833 " 48.624 



2.5780 " 5.3055 " 48.591 



Mean, 48.605, =h .0096 



In a later paper Cleve || gives syntheses of yttrium sulphate made with 

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

 ages are as follows : 



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



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



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



g K. Svenska Vet. Akad. Handlingar, Bd. i, No. S. 1873. 



|j K. Svenska Vet. Akad. Handlingar, No. 9, 1882. See also Bull. Soc. Chim., 39, 120. 1883. 



