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This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced

This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced

This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced

Excerpt from Proceedings of the American Philosophical Society, Vol. 58: Held at Philadelphia for Promoting Useful Knowledge, 1919 I. Nonsocial Parasites. I. So