At last, in an excellent monograph, the enormous amount of clinical observations and research on brucellosis during the past 60 years is presented, and presented in an unbiased manner. The consummation of this literary enterprise was favored by the close cooperation between outstanding medical clinicians and a pathologist in veterinary medicine. The source of the human infection, correctly designated an anthropozoonosis, not a zoonosis, is admirably documented. Every aspect of brucellosis in animals is considered and fully documented. The chapter dealing with the bacteriology and serology of the Brucella contains a useful discussion of the blocking and the Brucella-Coombs tests and their diagnostic value. The epidemiologic, clinical and pathologic aspects of human brucellosis are masterful considerations of the present-day knowledge. Under therapy, in the discussion of the use of insoluble amphotheric oxytetracycline as recommended by Castañeda, the thought is expressed that with this antibiotic the treatment of large animals may be economically feasible.