This article is a continuation of a preceding one which appeared in an earlier number of this Journal in which were presented the first two parts of this system of qualitative analysis, dealing respectively with the preparation of the solution, and the analysis of the silver, copper, and tin groups.' For the purposes of this investigation, for the general considerations underlying it, and for various conventional matters relating to its presentation, the reader is referred t o the introduction t o the preceding paper. Although the final form of the scheme of analysis of the groups here considered has been worked out during the past year by the authors of this article, much of the preliminary experimental work, especially that relating to the rarer metals, was carried on by others in this laboratory. It is unfortunately, scarcely practicable to indicate in just what respects each of these investigators has contributed to the final result; but we wish to express in a general way OUT great indebtedness t o Messrs. Howard I. Wood, Bart E. Schlesinger and Charles Field, grd, for the assistance which their work has been to us. ' Copyright, 1908, by Arthur A. Noyes.
Considerable experimental work has been recorded in the literature on the curious and as yet unexplained coagulating action of ultraviolet , p-, and X-rays on substances in the colloidal state.l Extraordinary 2s this effect appears, the case is still more complicated by the fact that these same rays have been employed by many investigators to produce certain hydrosols from the corresponding metals.2 Moreover in some respects the evidence of one author often contradicts the results obtained by others, so that the entire subject is in a decidedly unsatisfactory state.
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