The experiments have been, and are still being made under my direction by Dr. A. Libbertz and Stabsarzt Dr. E. Pfuhl. The necessary subjects and material have been provided by Prof. Brieger from his Polyclinic, Dr. W. Levy in his Private Surgical Clinic, Geheimrath Fraentzel and Oberstabsarzt R. Koehler in the Charite-Hospital, and Geheimrath Herr v. Bergmann in the Surgical University Clinic. To all these gentlemen and their assistants I here tender my heartfelt thanks for their untiring interest which they manifested for this subject and also for the disinterested help and aid which they have offered at all times and without which it would have been impossible for me to make such progress in a few months in this difficult and responsible investigation. As my work is far from being completed, I can not as yet make any statements relating to the origin and preparation of this remedy and reserve these for some future time.[1] The curative is composed of a clear brown fluid, which in itself is not perishable, even without special precautionary measures. For use this fluid must be more or less diluted and these dilutions are perishable when made with distilled water; Bacterian vegetation soon develops in them and they become turbid and are no longer fit for use. To prevent this the dilutions must be sterilized through heat and be kept under cotton batting or be prepared with a 5 per cent. phenol solution which is much simpler. Through repeated heating as also through the mixture with the phenol the efficiency of the diluted solution appears to be curtailed after a time and for that reason I have always used solutions as fresh as possible. The remedy does not act through the stomach; to effect a reliable action it must be applied subcutaneously. For our experiments we have exclusively used a syringe decided upon by myself for bacteriological purposes, which is supplied with a small india-rubber ball and which has no stamp. Such a syringe can be easily kept positively aseptic by rinsing with absolutely pure alcohol and on this we base the fact that not a single abscess has sprung from over a thousand injections. After trying various parts of the body as places for application we selected the skin of the back between the shoulderblades and in the lumbar region, because at these places the injection was almost painless and caused the least and in most cases no local reaction. Even at the beginning of our experiments we found that in one particularly important point the human subject was affected by the curative in a way decidedly differing from that of the animal subject generally used, the guinea pig. Therefore another confirmation of the rule for experimentors upon which hardly enough stress can be laid, not to rely upon a like effect upon the human being from the experiments on the animal without further confirmatory inquiry.