Observations on the rare earths : yttrium chloride and the atomic weight of yttrium . -11- IX. Gadolinite earth (average at. wt. )^46 grama of a jure white oxidewhioh had been obtained from bromate fraotions of gadolinite material andwhich had also been fractionated by the magnesium oxide and the potassium dou-ble sulphate methods were mixed with 165 grams of chromio aoid and fractionat-ed by the use of 250 oo. of ohrorcate solution per fraotion. A y11rium-didymiurn earth was also tried but no successful separation wasattained. Although the didymium did oonoentrate somewhat in the first fr
Observations on the rare earths : yttrium chloride and the atomic weight of yttrium . -11- IX. Gadolinite earth (average at. wt. )^46 grama of a jure white oxidewhioh had been obtained from bromate fraotions of gadolinite material andwhich had also been fractionated by the magnesium oxide and the potassium dou-ble sulphate methods were mixed with 165 grams of chromio aoid and fractionat-ed by the use of 250 oo. of ohrorcate solution per fraotion. A y11rium-didymiurn earth was also tried but no successful separation wasattained. Although the didymium did oonoentrate somewhat in the first frac-tions yet it remained in considerable quantities until the end, so it was oon-oluded that pure yttria oannot be prepared from material containing didymiumby this method except the didymium be first removed by saturation with potas-sium sulphate. The results of the fractionations are shown in Table I. The series arearranged horizontally, the upper numbers in each oase being the atomic weightsof the fraotions and the lower numbers being the grams per fraction. From these results
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