1929 - Population

Population

German chemist Adolf (Frederick Johann) Butenandt, 26, and Illinois-born biochemist Edward Adelbert Doisy, 35, isolate the sex hormone estrone—one of the three principal forms of estrogen (the others are estradiol and estriol; the most plentiful, estradiol, which is also the most powerful, is secreted by the ovaries, the placenta, the testes, and the outer cover of the adrenal glands, which also produces estrogens from steroid chemicals in body fat). Estrogen regulates the menstrual cycle, initiating the release of an egg from the ovaries each month, and it was reported last year by German obstetrician-gynecologist Bernhard Zondek, now 38, that pregnant women excrete large amounts of estrogen in their urine (see pregnancy test, 1930; androgen, 1931; progesterone, 1934).

Robert and Helen Lynd report in their book Middletown that use of contraceptives is almost universal among women in the U.S. professional and business classes but rare among working-class wives.

New York police raid Sanger's Clinic, but Margaret Sanger continues to campaign for birth control (see 1923; Planned Parenthood, 1942).

1921 1922 1923 1924 1925 1926 1927 1928 1929 1930