The extraordinary diversity of reports concerning the duration of pregnancy has made this a much mooted question. Many opinions relative to the longest and shortest period of pregnancy, associated with viability of the issue, have been expressed by authors on medical jurisprudence. There is perhaps no information more unsatisfactory or uncertain. Mistakes are so easily made in the date of the occurrence of pregnancy, or in the date of conception, that in the remarkable cases we can hardly accept the propositions as worthy evidence unless associated with other and more convincing facts, such as the appearance and stage of development of the fetus, or circumstances making conception impossible before or after the time mentioned, etc. It will be our endeavor to cite the more seemingly reliable instances of the anomalies of the time or duration of pregnancy reported in reputable periodicals or books. Short Pregnancies.--Hasenet speaks of the possibility of a living birth at four months; Capuron relates the instance of Fortunio Liceti, who was said to have been born at the end of four and a half months and lived to complete his twenty-fourth year. In the case of the Marechal de Richelieu, the Parliament of Paris decreed that an infant of five months possessed that capability of living the ordinary period of existence, i.e., the "viabilite," which the law of France requires for the establishment of inheritance. In his seventh book Pliny gives examples of men who were born out of time. Jonston gives instances of births at five, six, seven, and eight months. Bonnar quotes 5 living births before the one hundred and fiftieth day; 1 of one hundred and twenty-five days; 1 of one hundred and twenty days; 1 of one hundred and thirty-three days, surviving to twenty-one months; and 1 of one hundred and thirty-five days' pregnancy surviving to eighty years. Maisonneuve describes a case in which abortion took place at four and a half months; he found the fetus in its membranes two hours after delivery, and, on laying the membranes open, saw that it was living. He applied warmth, and partly succeeded in restoring it; for a few minutes respiratory movements were performed regularly, but it died in six hours. Taylor quotes Carter concerning the case of a fetus of five months which cried directly after it was born, and in the half hour it lived it tried frequently to breathe. He also quotes Davies, mentioning an instance of a fetus of five months, which lived twelve hours, weighing 2 pounds, and measuring 12 inches, and which cried vigorously. The pupillary membrane was entire, the testes had not descended, and the head was well covered with hair. Usher speaks of a woman who in 1876 was delivered of 2 male children on the one hundred and thirty-ninth day; both lived for an hour; the first weighed 10 ounces 6 drams and measured 9 3/4 inches; the other 10 ounces 7 drams, with the same length as the first. Routh speaks of a Mrs. F----, aged