Introduction to theoretical physics: By Arthur Haas, Ph.D., Professor of Physics in the University of Vienna. Translated from the third and fourth editions by T. Verschoyle, M.C., B.Sc., A.R.C.S., with a foreword by Prof. F. G. Donnan, F.R.S. Cloth, 812 × 512 inches. Vol. I, xv-331 pages. Vol. II, xi-414 pages. New York, D. Van Nostrand Company, 1925–1926. Price, $6 per volume