be looked upon as a matter of doubt; but their noise originates in the mouth, and not in the thorax. Still, however, in reference to this subject, the nature of the various localities exercises a very considerable influence, for in Macedonia, it is said, the frogs are dumb, and the same in reference to the wild boars there. Among birds, the smaller ones chirp and twitter the most, and more especially about the time of pairing. Others, again, exercise their voice while fighting, the quail, for instance; others before they begin to fight, such as the partridge; and others when they have gained the victory, the dunghill cock, for instance. The males in these species have a peculiar note of their own, while in others, the nightingale for example, the male has the same note as the female. Some birds sing all the year round, others only at certain times of the year, as we have already mentioned when speaking of them individually. The elephant produces a noise similar to that of sneezing, by the aid of the mouth, and independently of the nostrils; but by means of the nostrils it emits a sound similar to the hoarse braying of a trumpet. It is only in the bovine race that the voice of the female is the deepest, it being in all other kinds of animals more shrill than that of the male; it is the same also with the male of the human race when castrated. The infant at its birth is never heard to utter a cry before it has entirely left the uterus: it begins to speak at the end of the first year. A son of Crœsus,[360] however, spoke when only six months old, and, while yet wielding the child’s rattle, afforded portentous omens, for it was at the same period that his father’s empire fell. Those children which begin to speak the soonest, begin to walk the latest. The human voice acquires additional strength at the fourteenth year; but in old age it becomes more shrill again, and there is no living creature in which it is subject to more frequent changes.