ז שליא דתנן שליא בבית הבית טמא ולא שהשליא ולד אלא שאין שליא בלא ולד ר"ש אומר נמוק הולד עד שלא יצא
7 did the Sages follow the majority rule<span class="x" onmousemove="('comment',' Sc. the majority of the respective cases concerning which no doubt exists. ');"><sup>17</sup></span> and treated them as certainties, viz., the 'source', the 'placenta' and the 'piece'. The 'source'? The case already spoken of.<span class="x" onmousemove="('comment',' In the last clause of our Mishnah, and in the ruling of R. Hiyya (supra 17b), from which it is obvious that, since mostly the blood in question issues from the source, any blood in the ante-chamber is assumed to originate from that source. ');"><sup>18</sup></span> The 'placenta'? Concerning which we have learnt: If a placenta<span class="x" onmousemove="('comment',' About which it is unknown whether it did or did not contain a dead embryo. ');"><sup>19</sup></span> is within a house, the house is unclean;<span class="x" onmousemove="('comment',' As overshadowing a corpse, though it is unknown (cf. prev. n.) whether the placenta contained one. ');"><sup>20</sup></span> and this is so not because a placenta is regarded as a child but because generally there is no placenta without a child in it.<span class="x" onmousemove="('comment',' From which it is obvious that the uncleanness of the placenta is regarded as a certainty by the majority rule, since most placentas contain embryos. ');"><sup>21</sup></span> R. Simeon said, The child might have been mashed<span class="x" onmousemove="('comment',' And mixed up with the blood of birth which, representing the greater part of the mixture, neutralizes it. ');"><sup>22</sup></span>