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The experimental work described in this dissertation was done at the University of Copenhagen and is fundamental, its immediate importance concerning chiefly immunology and general physiology. The body of the text is in Danish, but a detailed summary in readable German is given on pages 210 to 219 and should be called to the attention of any one who wishes to attempt work in this difficult field, since some of the sources of error in the determinations of phagocytic activity are only beginning to be appreciated. The influence of the salts of thirty-nine metals on phagocytosis was studied. Thirty-three were found to possess optimum concentrations at which they stimulated phagocytosis. These optima lay distributed within wide limits (10-1 to 10-10 molar), and no relation was found between the position of the metallic element in the periodic table and its optimum concentration for phagocytosis. The stimulation in the case