NOTE.—This English edition has been enlarged and revised by the author and editor in collaboration with the following specialists: C. E. Beecher, J. M. Clarke, W. H. Dall, G. J. Hinde, A. Hyatt, J. S. Kingsley, H. A. Pilsbry, C. Schuchert, S. H. Scudder, W. P. Sladen, E. O. Ulrich, C. Wachsmuth, A. S. Woodward, E. C. Case, J. B. Hatcher, H. F. Osborn, S. W. Williston, F. A. Lucas. A Text-book of General Bacteriology By WILLIAM DODGE FROST, Ph.D., Associate Professor of Bacteriology in the University of Wisconsin; and EUGENE FRANKLIN McCAMPBELL, Ph.D., Associate Professor of Bacteriology in the Ohio State University _Cloth, 340 pp., $1.60 net_ Comparative Anatomy of Vertebrates Adapted from the German of DR. ROBERT WIEDERSHEIM, Professor of Anatomy, and Director of the Institute of Human and Comparative Anatomy in the University of Freiburg-in-Baden. By W. N. PARKER, Ph.D., Professor of Zoölogy at the University College of South Wales and Monmouthshire in the University of Wales _Cloth, 576 pp., 8vo, $3.75 net_ Text-book of the Embryology of Man and Mammals By DR. OSCAR HERTWIG, Professor extraordinarius of Anatomy and Comparative Anatomy, Director of the II Anatomical Institute of the University of Berlin. Translated from the Third German Edition by EDWARD L. MARK, Ph.D., Hersey Professor of Anatomy in Harvard University _Cloth, 670 pp., 8vo, $5.25 net_ PUBLISHED BY THE MACMILLAN COMPANY 64-66 Fifth Avenue, New York