A follow-up to the hyssop/"eizov" discussion. Also, continuing the case of one who harvested grain and then decided not to eat it, but to use it for schach. Where both action and intent can be relevant, and action demonstrates intent. Plus, turning straw over with a pitchfork. Which leads into a comparison between the prayers of tzadikim and a pitchfork. Also, a new mishnah, and the question of wooden boards as schach - which involves a dispute by R. Yehudah and R. Meir, and is followed up in the Gemara with a dispute about the dispute by Rav and Shmuel. The whole topic, together with the previous mishnah establishes the boundaries of the range of permanence in schach. Plus, mention of the case of danger for a sukkah.