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Another supplement to J. Jadassohn's handbook of skin and venereal diseases concerns malignant tumors and leukemia. Its planning and completion were delayed because of the deaths of the original editor, Gottron, and the author of one chapter, Lausecker. This volume was compiled by seven German and Austrian dermatologists and one German pathologist. They present chapters dealing with such sarcomas of the skin as fibrosarcoma, malignant histiocytic tumors, liposarcoma, leiomyosarcoma, and rhabdomyosarcoma. The various angiosarcomas, including Kaposi's hemorrhagic sarcoma, malignant reticulum cell sarcoma, clear cell sarcoma of the tendons and fasciae, epithelioid sarcoma, secondary sarcoma after scarring and irradiation, malignant granular cell tumor, melanoma, myxosarcoma, malignant mesenchymoma, synovial sarcoma, extraskeletal chondrosarcoma, osteogenic sarcoma, and lymphocytic sarcoma are also presented. The chapter on squamous cell carcinoma is divided into the following subchapters: precanceroses (Bowen's disease; erythroplasia of Queyrat; Paget's disease; actinic, tar, arsenical, and radiation keratoses; leukoplakia; xeroderma pigmentosum; epidermodysplasia verruciformis; various