Our results may be briefly summarized:

1. Blood, when defibrinated, soon loses its power to maintain the activity of the higher nervous centers, and its nutritive properties for all tissues quickly diminish.

2. Artificial fluids, as a substitute for blood, are not satisfactory.

3. The proper oxygenation of the blood is an indispensable adjunct in the resuscitation of an animal.

4. The heart usually continues to beat for some minutes after it ceases to affect a mercury manometer, and resuscitation of it within this period by extra-thoracic massage and artificial respiration is sometimes successful.

5. Resuscitation of the heart by direct massage is the most certain method at our command.

6. A proper blood-pressure is an indispensable condition for the continued normal activity of the heart.

7. Anæsthetics, hemorrhage and induced currents applied to the heart render resuscitation more difficult than asphyxia alone.

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