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It is now more than four years since this research was begun, and it has necessitated such a large number of experiments that, if given in detail, they would till several hundred pages, and, therefore, only a brief account of the results, with details of a few typical experiments, can be given here. During the time we have been engaged in this research a great deal of work upon the physiological action of aromatic compounds has been done by other observers; but upon trying to collate their results, with a view to arriving at some general conclusions, it appeared that the conditions under which the various experiments have been carried out have differed to such an extent as to render comparison very difficult.

VIII. Contributions to the study of the connection between chemical constitution and physiological action.—Part II