The third section builds on the previous section. The focal passage here is Niddah 2b - this discusses a case in which we were certain about the status of an object (in that passage a ritual bath) on day one and again on day seven but we are unsure about the time in between (days 2-6). The question is whether the certainty on day one is of primary importance in deciding the status of the next few days ("Chazakah D' Me'ikara") or the certainty of day seven is more important ("Chazaka D' Hashta"). Heller points out (based on various Talmudic passages) that if the object is likely to change (in his example a girl who is likely to mature) then the "Chazakah D'Hashta" takes precedence.