Abstract
It is well known that the normal blood serum of various animals possesses the power to destroy many species of bacteria. The normal serum of man as well as of a few other Primates is known to have the additional capacity to lyse some species of trypanosomes and to neutralize certain filterable viruses. No such antagonistic property of the normal serum against multicellular forms has been described to our knowledge. During the past summer (1935) it was our privilege, in the Helminthology Laboratory of the University of Michigan Biological Station at Douglas Lake, Michigan, to test the normal serums of various animals upon a considerable number of species of cercariae, one of the larval stages of trematodes. A positive cercaricidal effect was obtained in many instances, as will be seen.
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