The book is divided into three sections: cardiac disturbances (functional); borderland between functional disturbances and organic disease of the heart, and organic heart disease. Many of the current views about disturbances and diseases of the heart in childhood and youth are founded on inductions and inferences; but the signs, symptoms, prognosis and treatment are often different from those in later life. Under the various sections the various disturbances and diseases of the heart in early life are discussed, accompanied by case reports, polygraphic tracings and often also the electrocardiogram. The author, being a pupil of Mackenzie, recommends the polygraphic method as the simplest and most exact method of studying the heart. The pathology of the heart is somewhat neglected, and no mention is made of experimental endocarditis as produced by Rosenau. The book is up to date, and the tracings are good and warrant the attention of the pediatrician.