This edition differs only slightly from the fifth. Material on such subjects as undulant fever, Calmette's tuberculosis vaccine, tularemia and diphtheria toxoid has been brought down to date. Of the many books intended for use in the schools of nursing, this one is among the best. It is impossible to present the subject of bacteriology in so few pages adequately except by omitting many important things or by making extremely brief discussions. The latter is the method here followed.