About a year ago Sherrick 1 reported that "a positive pustular or nodular luetin reaction can be obtained in 99 per cent. of all persons irrespective of the presence of syphilis, by the administration of potassium iodid, either simultaneously, or shortly before or after the intradermal test. Other substances, such as agar and starch, when injected intradermally, will give a similar reaction when potassium iodid is administered," and other drugs containing iodin were found to have a similar

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... t. These observations were considered of such importance, not only in connection with the luetin test, but also in relation to anaphylactic phenomena in general and skin reactions in particular, that we have been studying the effect of iodids, bromids, chlorids, ether, chloroform and other drugs on