The varieties of the glandiferous trees are numerous, and they are found to differ in fruit, locality, sex, and taste; the acorn of the beech having one shape, that of the quercus another, and that, again, of the holm-oak another. The various species also, among themselves, offer a considerable number of varieties. In addition to this, some of these trees are of a wild nature, while the fruits of others are of a less acrid flavour, owing to a more careful cultivation. Then, too, there is a difference between the varieties which grow on the mountains and those of the plains; the males differ from the females, and there are considerable modifications in the flavour of their fruit. That of the beech[2230] is the sweetest of all; so much so, that, according to Cornelius Alexander, the people of the city of Chios, when besieged, supported themselves wholly on mast. The different varieties cannot possibly be distinguished by their respective names, which vary according to their several localities. The quercus[2231] and the robur[2232] we see growing everywhere, but not so with the æsculus;[2233] while a fourth kind, known as the cerrus,[2234] is not so much as known throughout the greater part of Italy. We shall distinguish them, therefore, by their characteristic features, and when circumstances render it necessary, shall give their Greek names as well. CHAP. 7. (6.)—THE BEECH. The acorn of the beech[2235] is similar in appearance to a kernel, enclosed in a shell of triangular shape. The leaf is thin and one of the very lightest, is similar in appearance to that of the poplar, and turns yellow with remarkable rapidity. From the middle of the leaf, and upon the upper side of it, there mostly shoots a little green berry, with a pointed top.[2236] The beech is particularly agreeable to rats and mice; and hence it is, that where this tree abounds, those creatures are sure to be plentiful also. The leaves are also very fattening for dormice, and good for thrushes too. Almost all trees bear an average crop but once in two years; this is the case with the beech more particularly. CHAP. 8.—THE OTHER ACORNS—WOOD FOR FUEL. The other trees that bear acorns, properly so called, are the robur, the æsculus, the cerrus, the holm-oak,[2237] and the cork-tree:[2238] it is contained in a rivelled calyx, which embraces more or less of it, according to the several varieties. The leaves of these trees, those of the holm-oak excepted, are weighty, pulpy, long, and jagged at the edges, and they do not turn yellow before they fall, as with the beech: they are also longer or shorter, as the case may be.