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The first two editions of this book were published in 1934 and 1935 respectively, and they were popular. In fact, the book was translated into English and Spanish. At the present time, English, Spanish, Italian and French translations are being prepared of this edition.
The author deals with procreation both in animals and in humans. The major portion of the book is devoted to the periodicity of the menstrual cycle and to ovulation. The author discusses 15 different methods of attempting to determine the exact time of ovulation in women. From his own extensive studies and the many reports in English, French and American literature, he states there is general agreement that ovulation occurs physiologically on the fifteenth day before menstruation.
The Knaus-Ogino rhythm method of contraception is universally known. Knaus insists that the only possible way a woman can determine the exact day of ovulation in every menstrual cycle
Die Physiologie der Zeugung des Menschen. JAMA. 1950;144(3):279. doi:10.1001/jama.1950.02920030067029
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