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This is a valuable monograph discussing history, world statistics, heredity, the Köbner phenomenon, pruritus, arthropathy, combinations of psoriasis with other diseases, differential diagnosis, pathology, biochemistry, etiology, prognosis, and therapy. Of interest is the remark that psoriasis has never been found on the nipples. Also of interest is the point that, at present, with the absence of gonorrhea, there is no reason to discuss differential diagnosis between psoriasis and gonorrheal keratoderma. The statement that psoriasis limited exclusively to the nails has never been seen, is questionable. Also questionable is the stated nonexistence of psoriasis of the mucous membranes in absence of cutaneous psoriasis. A chapter is devoted to true psoriatic leucoderma, which is considered by the author very rare. It must be, since this reviewer has never seen such a case. An interesting remark is that aggravation of psoriasis during pregnancy is a sign of some abnormality. Nardelli devised a lipidic