Chapter XII

The factor which brings the expulsive faculty into

## action is essentially a condition of the organ or its

contents which is the reverse of that which determined attraction. Analogy between abortion and normal parturition. Whatever produces _discomfort_ must be expelled. That discomfort also determines expulsion of contents from gall-bladder is not so evident as in the case of stomach, uterus, urinary bladder, etc., but can be logically demonstrated.

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