"[S]urgical dangers warned against any medical procedure. Induced abortion, in particular, involved internal use of surgical instruments, and the inevitable introduction of infection into the womb. Far better, the legislature obviously deemed, that a woman risk childbirth, than death on the operating table. Only when the risks cancelled themselves out did she have an option. Today the comparative risks weigh heavily in favor of permitting induced abortion, not as an emergency matter as in 1851, but as an elective medical procedure. Surgery in those times was almost always fatal. As the next section shows, medicine is a different science today. Induced abortion, in medical practice today, is a relatively minor surgical procedure, insofar as risks to the patient’s physical or mental well-being are concerned...."