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124 the extreme south; the National Library is at Aberystwyth, on the western sea. The thriving industries, the densely populated districts, and the frequent and active railways, are in the extreme south or in the extreme north; and they are separated by five or six shires of pastures and sheep-runs, without large towns, and with comparatively few railways. In the three southern counties—Glamorgan, Monmouth, and Carmarthen—the population is between two and six people to 10 acres, and the industrial population is from twelve to three times the number of the agricultural. In the central counties—Brecon, Radnor, Cardigan, Merioneth, Montgomery—the population is below one for 10 acres; the industrial and agricultural population are about equal, except in Radnor, where the agricultural is more than two to one. Though Merioneth has more sheep even than Brecon—and each of them has nearly 400,000—its industrial population, owing to the slate districts, is double the agricultural. The population begins to thicken again as we get nearer the slate, limestone, and coal districts. In Denbigh it is two to the 10 acres, in Carnarvon it is three, and in Flint it rises to four or five. In these northern