The olive of which [the Rabbis] spoke [is] neither large nor small but of medium size, which is an aguri. The barley of which [the Rabbis] spoke [is] neither large nor small but of medium size, which is a desert [barley]. The lentil of which [the Rabbis] spoke [is] neither large nor small but of medium size, which is an Egyptian [lentil]. All movable objects convey tumah when they are as thick as an ox-goad, [one that is] neither big nor small but one of medium size. What is [meant by] one of medium size? Any one that has a circumference of one handbreadth.