The robur, in addition to its fruit, has a great number of other productions: it bears2257 the two varieties of the gall-nut, and a production which closely resembles the mulberry,2258 except that it differs from it in being dry and hard: for the most part it bears a resemblance to a bull’s head, and in the inside there is a fruit very similar to the stone of the olive. Little balls2259 also are found growing on the robur, not unlike nuts in appearance, and containing within them a kind of soft wool, which is used for burning in lamps; for it will keep burning without oil, which is the case also with the black gall-nut. It bears another kind, too, of little ball, covered with hair,2260 but used for no purpose: in spring, however, this contains a juice like honey. In the hollows formed by the union of the trunk and branches of this tree there are found also small round balls,2261 which adhere bodily to the bark, and not by means of a stalk: at the point of junction they are white, but the rest of the body is spotted all over with black: inside they are of a scarlet colour, but on opening them they are found to be empty, and are of a bitter taste.

Sometimes, too, the robur bears a kind of pumice,2262 as well as little balls, which are formed of the leaves rolled up; upon the veins of the leaves, too, there are watery pustules, of a whitish hue, and transparent while they are soft; in these a kind of gnat2263 is produced, and they come to maturity just in the same way that the ordinary gall-nut does.