PREFACE TO SEVENTH EDITION.

The past several years have been a period ot active investigation in several of the chief dermatologic diseases, notably syphilis, lep­ rosy, sporotrichosis, pellagra, ringworm, and tropical affections, and the results of such investigations, partly considered in the edition of 1910 of this work, will be found, with the increased knowledge and advances since that date, more fully presented in the present volume. In many of the other diseases besides those just named new facts, some of considerable importance, have also been brought forward and likewise incorporated. Descriptions of new or more or less recently acknowledged independent disorders are presented for the first time, among which may be mentioned prurigo nodularis, granuloma pyogenicum, benign sarcoid, and keratosis blenorrhagica. The value of illustrations has again been recognized by the addition of about forty new cuts, the most important being several of leprosy, prurigo nodularis, lupus vulgaris, Oriental sore, dermatitis vegetans, annular syphiloderm, the ring type of impetigo contagiosa, and cul­ tures (Sabouraud) of the main ringworm fungi. In order that the vast amount of text changes, new matter, and additional illustrations should have fair presentation without too great an increase in the number of pages, much that was old and more or less obsolete has been eliminated. The revision has been, therefore, as will readily be seen, of more than average character—so extensive, in fact, as to necessitate a complete resetting of the book. As heretofore, the new literature references are largely those of papers, which give an ana­ lytical review of previous contributions on the subject.

H. W. S.

1634 SPRUCE STREET, PHILADELPHIA.

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