Lulavim from the Iron Mountain - are these kosher with an exception that is not, or not kosher with an exception that is? With a possible explanation why it's called the Iron Mountain. Plus, the length of the lulav, both for the waving of it and in relation to the hadas (myrtle) and aravah (willow). Plus, R. Tarfon's apparent extreme stringency with regard to the length of the 4 minim. Also, a new mishnah on the details of the hadasim. Plumbing the depths of what plant this needs to be, without really raising questions as to the identity of the myrtle.