The authors have written an excellent treatise on diseases of the oral mucosa, based largely on articles selected from the literature and on their own extensive experience in an oral disease clinic (Tufts University). The text is authoritative and complete. The chapters on lichen planus, desquamative gingivitis, and carcinoma are particularly good. An excellent bibliography is supplied at the end of each chapter. Intra-oral photography is difficult, and the clinical photographs lack brilliance, and in some cases. sharpness. The juxtaposition of three or more photographs is confusing. The statement, "Current theories are divided into an epithelial and neurogenic origin of nevus cells," would seem outdated. The epithelial origin has very few adherents at this time. Also, hypersplenism (not splenomegaly) is a cause of leukopenia. The statement that yaws is of bacterial origin caused by a spirochete is inexplicable. The concept that tubercle bacilli crowd the nuclei of the Langhans' giant