"None of the Justices claim there is a specific textual guarantee of abortion to be found anywhere in the constitutional document. Nor does the abortion claim find legitimacy within the background principles of common law out of which the American Constitution emerged. As Bracton records, and the draft opinions within the internal Marshall papers indicate the Justices knew, abortion has little common law support, and was clearly thought by some to be homicide. [II Bracton, On the Laws and Customs of England 341 (Thorne ed. 1968), a citation to which can be found in Justice Blackmun's 4th circulated draft in December 1972]. Because of the more rudimentary nature of science in the 18th and 19th centuries, the common law drew a distinction between abortions before and after quickening [16 to 18 weeks], but under English codification in 1803 both were criminal only in different degrees. When medical science advanced, the quickening distinction receded, and penalties for all abortions increased. In 1868, when the 14th Amendment was adopted, statutory prohibitions or restrictions on abortion were commonplace. Twenty-eight states of the then 37 and 8 territories banned or limited abortion. [J. Mohr, Abortion in America at 200 (1978)]. The Court's drafts also reveal that the decision was not being guided by ancient precepts of medical ethics. In this respect, the Hippocratic Oath dating back three to four hundred years before Christ, had doctors pledging that they "will give no deadly medicine to anyone if asked, nor suggest any such counsel; and in like manner . . . not give to a woman a pessary to produce abortion." [The 4th circulated draft of Justice Blackmun's opinion in Roe cites the Hippocratic Oath, but cavalierly dismisses it on the basis of academic writing that found it to be held as true only within Pythagorean Greek culture. Why the Pythagoreans should be so ill-treated, or deemed uninfluential, is not explained. Indeed the Oath, which coincides with prevalent Christian belief since the end of antiquity, became the "nucleus" of medical ethics.]"