A pair of crucibles (1 and 2 in the figure) was selected and treated as described. Another pair about the same size but a little lighter was prepared in exactly the same way. Each pair was placed in the nickel crucible and heated by means of the blast-lamp for half an hour. After cooling in desiccators, both pairs of crucibles where placed in the closed balance until no longer affected by the moisture of the air, which was also dried by calcium chloride. The tare was brought to within one tenth of a milligram of the weight of the crucibles against which it was being tared, by adding fragments of porcelain obtained from another crucible of the same composition. The difference in weight between the tare and its mate was then accurately ascertained. Each pair of crucibles was again placed in the nickel crucible and blasted for half an hour. They were then reweighed, to determine if the difference in weight previously found had remained constant. In no case was any change detected, yet this precaution was always taken. The Results. The following table contains the results of ten successive determinations. At. Wt. Cd. At. Wt. Cd. Wt. of Cd. Wt. of CdO. (O = 16) (O = 15.96) I 1.77891 2.03288 112.070 111.790 II 1.82492 2.08544 112.078 111.798 III 1.74688 1.99626 112.078 111.798 IV 1.57000 1.79418 112.053 111.773 V 1.98481 2.26820 112.061 111.781 VI 2.27297 2.59751 112.059 111.779 VII 1.75695 2.00775 112.086 111.806 VIII 1.70028 1.94305 112.059 111.779 IX 1.92237 2.19679 112.083 111.803 X 1.92081 2.19502 112.078 111.798 ------- ------- ------- ------- Mean, 112.0705. 111.7905. Maximum, 112.086. 111.806. Minimum, 112.053. 111.773. Difference, .033. .033. Calculating the atomic weight of cadmium from the total amount of metal used and oxide found, we have: At. Wt. of Cd. At. Wt. of Cd. (O = 16) (O = 15.96) 112.0706. 111.7904. These results agree more closely with those of von Hauer and Lenssen than with those of any other experimenter. The following table gives a comparison of the work of these investigators with that herein described: