Observations on the rare earths : yttrium chloride and the atomic weight of yttrium . d tofractionation of earth mixtures containing didymium or gadolinium unless theyare first removed by the potassium sulphate method. The determination of the ratio Y2O3 : Y2(S04.)3 as a means of finding theatomic weight of yttrium was studied and found to be rather unoertain. Themethod aprarently gives atomio weight values which are lower than those gain-ed by other more reliable methods. The ratio Ya03 : 2YC13 waR studied and some very consistent results wereobtained. Weighed quantities of yttrium oxide were
Observations on the rare earths : yttrium chloride and the atomic weight of yttrium . d tofractionation of earth mixtures containing didymium or gadolinium unless theyare first removed by the potassium sulphate method. The determination of the ratio Y2O3 : Y2(S04.)3 as a means of finding theatomic weight of yttrium was studied and found to be rather unoertain. Themethod aprarently gives atomio weight values which are lower than those gain-ed by other more reliable methods. The ratio Ya03 : 2YC13 waR studied and some very consistent results wereobtained. Weighed quantities of yttrium oxide were converted to anhydrousyttrium chloride in a quarts flask, and weighed. Three values varying and were obtained. By a more careful study of the details thisvariation oan probably be reduced by-half. Yttrium material was prepared having only a very faint spectra in 10 of saturated solutions of the chloride. It was considered to have notmore than one-half per cent, erbium present. The average atomic weight ob-tained by the oxide-chloride method was -25- REFERENCES. 1) Gibbs, Am. J. Sol. (3) 37, 352 (1864 ); Z. anal. Ch. 3, 397. 2) Erk, Z. f. Ch. ( ) 7, 107( 1871 ); Z. anal. Ch. 10, 461. 3 ) James, J. Cfc. So©., 30, 972 (1908); Ch. N. 97, 306. 4 ) Baxter and Daudt, J. Am. Ch. Boo*, 3_0, 563 ( 1908 ). 5 ) Jfuthmann and Roelig, Ber. 31, 1719 ( 1898 ). 6 ) Dercarcav, Compt. rend. 130, 1019 ( 1900 ). 7) DroRRbach, Ber. 35, 2827 (1902). 8 ) Wuthmann and Weiss, Ann. 331, 1 (1903 ). 9) Auer von Welsbaoh, Monatsh. 6^ 477 (1885) 11 ) Urbain and Laoombe, rend. 132, 792 (1903 ); 136, 84; 138, 627. 12 ) James, J. Am. Ch. Soc, 30, 182 ( 1908 ). 13 ) Berlin, K. Vet. Ak. Hdl.,(1835) 212; B. J. ( 1837 ), 16 Jg. , 139. 14) Pattison and Clark, Ch. N., J_6, 259 ( 1868); Z. anal. Ch. 7, 249. 15 ) Brauell, Diss. Uni. Jena, p. 11, ( 1675 ). 16) Loose, Diss. Uni. SWtnoken, p. 16-17, ( 1692 ). 17) Kruss arid Loose, Z. anorg. Ch., 3^ 103, ( 1893 ).
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