Daugherty's Economic Zoölogy

Economic Zoölogy. By L. S. Daugherty, M. S., Ph. D., Professor of Zoölogy, State Normal School, Kirksville, Mo., and M. C. Daugherty, author with Jackson of "Agriculture Through the Laboratory and School Garden." Part I: Field and Laboratory Guide. 12mo of 237 pages, interleaved. Cloth, $1.25 net. Part II: Principles. 12mo of 406 pages, illustrated. Cloth, $2.00 net.