CXCVIII. THE DETERMINATION OF SMALL QUANTITIES OF IODINE IN BLOOD. By ERIC NEWMARCH ALLOTT, JAMES ARNOLD DAUPHINEE AND WILLIAM HOLDSWORTH HURTLEY

SINcE the publication of von Fellenberg's method [1923] for the determination of small quantities of iodine, a very large number of new methods and modifications have been described, some of which claim a surprising degree of accuracy. The multiplicity of methods is sufficient to show that none of them is really satisfactory. The von Fellenberg method includes two methods for the final determination, colorimetric and titrimetric. We have attempted to produce a method which is free from some of the objections which can be raised against the older ones. While it can be said that the colorimetric method here described, which was devised by one of us (W. H. H.), is satisfactory within the limits of such a method, the titrimetric method has not been quite completed; owing, however, to the impossibility of further collaboration it seemed desirable to record such observations as we have made.