CHAPTER XIV.--Mechanism of Delivery in Presentations of

the Trunk, 203 Mechanism of Delivery in Presentations of the Trunk by Spontaneous Evolution, 204

Section V.

THE PHYSIOLOGY OF SPONTANEOUS DELIVERY, OR CHILDBIRTH, AND THE MANNER OF CONDUCTING A NATURAL LABOR.

Delivery.--Causes of Labor, 211 Signs of Delivery, 212

Natural Labor.--First Period, 214 Second Period, 216 Duration of Natural Labor, 220