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CHAPTER FIVE

in such a way as to interlock the os with the glans penis, when she at once became pregnant. After the birth of this child, no second orgasm of the kind could be achieved and no second child resulted in spite of every effort.

Comment.—This method is of much greater theoretical interest than practical utility for any but exceptional circumstances.

(3) Sitting upright the moment after ejaculation has taken place and coughing violently or taking some other exercise to contract the pelvic muscles.

These methods, which are very primitive, probably prehistoric in origin, are of considerable interest in connection with the history of contraceptives (see p. 242). Such

    enor. Roughly I class them for my own consideration into three main groups:—

    1. Normally weak acid + temporarily alkaline (often associated with fairly intellectual and yet fertile type).
    2. Excessively acid + insufficiently alkaline (often associated with "brainy" and ascetic type, tendency to infertility).
    3. Weakly acid + strongly alkaline (often associated with unintellectual, fertile type. If extreme, what I have called in lectures the "incorrigibly fertile, alkaline type").
    The balances between alkalinity and acidity are the resultant, of course, of the persistent vaginal exudations and the fluids specially secreted under the stimulus of coitus.

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