SUMMARY 1. All methods of artificial respiration require a free airway from the exterior to the alveoli so that effective pulmonary exchange can occur. 2. All methods of artificial respiration should be accompanied by effective anti‐shock measures. 3. A variety of methods, supine pressure methods, prone pressure methods, positive inflation of the lungs and postural methods either in manual or in mechanical form can provide adequate pulmonary ventilation. Any method selected should be carried out intelligently so that the occurrence of this pulmonary exchange is assured. 4. It is probable that the efficiency of methods of artificial respiration will be assessed by the degree to which they assist the blood circulation. There is evidence that there are differences in this respect between the methods, but we cannot yet state with certainty which type of method produces the most desirable effect in man.