Paul Lewis is the author of Physiological Studies on the Pathogenicity of Fusarium Lycopersici Sacc. for the Tomato Plant (1935), Intelligence, Its Manifestations and Measurement (1933), Fertilizer Experiments with Ten Market-garden Crops in Cook County, Illinois (1932), A Study of the Relationship Between the Intelligence and Moral Judgments of College Students (1929), A final call to the Jews: or An explanation of the original promise; a full answer to all objections against Christianity.