The preparation of this year-book, annually, is no small task, but the present volume is up to the usual high standard. We miss the name of the late Dr. William Pepper from the list of contributors, although his work has been creditably taken up by Drs. Alfred Stengel and D. L. Edsall. Other contributors to the volume are Drs. Samuel W. Abbott, John J. Abel, J. M. Baldy, C. H. Burnett, Archibald Church, J. C. DaCosta, W. A. Newman Dorland, Louis A. Duhring, V. P. Gibney, H. A. Griffin, J. Guitéras, C. A. Hamann, A. Hand, H. F. Hansell, M. B. Hartzell, Barton C. Hirst, E. Fletcher Ingals, Wyatt Johnston, W. W. Keen, H. G. Ohls, Wendell Reber, David Riesman, Louis Starr, G. N. Stewart, J. B. Tillinghast and J. Hilton Waterman. A number of full-page plates add much to the value of the work, which should be in every