Rav Chiya, the son of Adda, was tutor to the children of Resh Lakish, and once absented himself from his duties for three days. On his return he was questioned as to the reason of his conduct, and he gave the following reply: tt My father bequeathed to me a vine, trained on high trellis-work as a bower, from which I gathered the first day three hundred bunches, each of which yielded a gerav of wine (a gerav is a measure containing as much as 288 eggshells would contain).
On the second day I again gathered three hundred bunches of smaller size, two only producing one gerav (one bunch yielding the quantity of wine 144 egg-shells would contain). The third day I also gathered three hundred bunches, but only three bunches to the gerav, and have yet left more than half of the grapes free for any one to gather them.8 Thereupon Resh Lakish observed to him, " If thou hadst not been so negligent (losing time in the instruction of my children), it would have yielded still more." Kethuboth, fol. ill, col. 2.