Abstract
It has been indicated in the foregoing paper than an incitor element* is to be found in the blood of those who have made an immunising response to tunercular infection, or, as the case may be, to an inoculation of a tubercle vaccine. This fact does not stand itself. Rectal of Previous Observations on the same Subject. The observation of Metchnikoff, following in sequence upon the classical researches of R. Pfeiffer on the intraperitoneal destruction of bacteria by the aid of immune sera, first drew attention to the fact that very active phagocy-tosis comes under observation when bacterial cultures, or as the case may be spermatozoa, are introduced into the peritoneal cavity of normal animals in association with heated serum derived from immunised animals.

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