JAMA. 1930;95(7):546-547. doi:10.1001/jama.1930.02720070084025.
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Experiments on the Onset of Labor  Dr. Perez presented a communication before the Sociedad de Pediatría of Buenos Aires, May 8, in which he reported the results of experiments on the humoral factor in the onset of labor. He made transfusions of from 50 to 300 cc. of citrated blood which had been withdrawn from parturients into thirty pregnant women at full term in whom labor had not yet started. In nearly all the thirty cases, immediately after the transfusion, either the premonitory symptoms of labor or its actual onset occurred. In 60 per cent of these cases, complete delivery followed; that is, labor continued till the expulsion of the fetus and the placenta. Transfusion was also made with blood which had been withdrawn from pregnant women at full term, but who were not as yet in labor, into twenty-five women at full term. In none of the last mentioned


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