On the action exerted upon the staphylococcus pyogenes by human blood fluids, and on the elaboration of protective elements in the human organism in response to inoculations of a staphylococcus vaccine.

The subject matter with which we have here to deal may be distributed under the following headings :— (1) Determination of the nature of the action which is exerted upon the Staphylococcus pyogenes by normal human blood fluids, and by the blood fluids of patients who have been inoculated with a staphylococcus vaccine. (2) Comparison of the phagocytic power of the subjects of staphyloeoccus invasion with the phagocytic power of normal individuals. (3) Distribution in the infected organism of the opsonins which here come into consideration. (4) Determination of the question as to whether the opsonins are present in the blood of the infant at birth. (5) Determination of the course of the reaction of immunisation which supervenes upon the inoculation of a staphylococcus vaccine.