"This is a handy pocket dictionary, which is so full and complete that it puts to shame some of the more pretentious volumes."--_Journal of the American Medical Association._ "We have consulted it for the meaning of many new and rare terms, and have not met with a disappointment. The definitions are exquisitely clear and concise. We have never found so much information in so small a space."--_Dublin Journal of Medical Science._ "This is a handy little volume that, upon examination, seems fairly to fulfil the promise of its title, and to contain a vast amount of information in a very small space.... It is somewhat surprising that it contains so many of the rarer terms used in medicine."--_Bulletin Johns Hopkins Hospital_, Baltimore. W. B. SAUNDERS COMPANY, 925 Walnut St., Phila. London: 9, Henrietta Street, Covent Garden * * * * * ESSENTIALS OF DISEASES OF THE SKIN. Since the issue of the first volume of the #Saunders Question-Compends#, OVER 290,000 COPIES of these unrivalled publications have been sold. This enormous sale is indisputable evidence of the value of these self-helps to students and physicians. Saunders' Question-Compends. No. 11. ESSENTIALS OF DISEASES OF THE SKIN Including the Syphilodermata Arranged in the Form of Questions and Answers Prepared Especially for Students of Medicine by HENRY W. STELWAGON, M.D., PH.D. Professor of Dermatology in the Jefferson Medical College, Philadelphia; Dermatologist to the Howard and Philadelphia Hospitals, etc. Seventh Edition, Thoroughly Revised Illustrated Philadelphia and London W. B. Saunders Company 1909 Set up, electrotyped, printed, 1890. Reprinted July, 1891. Revised, reprinted, June, 1894. Reprinted March, 1897. Revised, reprinted, August, 1899. Reprinted September, 1901, May, 1902, September, 1903. Revised, reprinted January, 1905. Reprinted March, 1906. Revised, reprinted March, 1909. Printed in America Press of W. B. Saunders Company Philadelphia PREFACE TO SEVENTH EDITION. In the present--seventh--edition the subject matter, especially as regards the practical part, has been gone over carefully and the necessary corrections and additions made. Nineteen new illustrations have been added, a few of the old ones being eliminated. It is hoped that the continued demand for this compend means a widening interest in the study of diseases of the skin, sufficiently keen as to lead to the desire for a still greater knowledge. H.W.S. PREFACE TO FIRST EDITION.