Across the middle of the island runs another chain of mountains, but lower in height. The atmosphere here is on the whole heavy and unwholesome. The reason is partly the salt that crystallizes here, partly the oppressive, violent south wind, and partly the fact that, because of the height of the mountains on the side towards Italy, the north winds are prevented, when they blow in summer, from cooling the atmosphere and the ground here. Others say that the cause is Cyrnus, which is separated from Sardinia by no more than eight stades of sea, and is hilly and high all over. So they think that Cyrnus prevents the west wind and the north wind from reaching as far as Sardinia.