This study, which was being conducted in connection with the work described in the preceding paper, has been interrupted by the war. In view of the indefinite postponement of its complete publication, it seems advisable at the present time to give a brief preliminary statement of the results, in so far as they have been clearly established. The following protocol of one of the experiments is illustrative of the essential findings.

The liver was removed from a dog actively sensitized to horse serum, and placed in a warm perfusion chamber. By means of a cannula tied in the portal vein the liver was washed out with a liter of salt solution. The defibrinated blood of the same animal was divided into equal portions of 200 cc. each. The organ was then perfused with one of these portions, the blood being passed through a number of times successively.

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