“…Whatever group is taken as the society which determines who may be killed is thereby taken as human. 187 But once spermatozoon and ovum meet and the conceptus is formed, such studies as have been made show that roughly in only 20 percent of the cases will spontaneous abortion occur. If there is such a difference, experience may be appealed to: to decide who is human on the basis of the sentiment of a given society has led to consequences which rational men would characterize as monstrous.…”