. The earth and its inhabitants ... uarterly Journal of the Geological Society, i. Hardman, Journal of the Royal Geological Society of Ireland, iv. 888 THE ]ÎRITISII ISLES. large a scale as in tlic mouutains bordering upon the Adriatic. Sometimes ithappens that the arch which covers one of the corroded hollows or channels givesway, and the chasm thus created may give birth to a lake, or lay open an under-ground river channel. It is thus that Lough Lena feeds both the Dell, a visibleatHuent of the Boyne, and an underground channel which communicates with ariver flowing into Lougli Eee. T
. The earth and its inhabitants ... uarterly Journal of the Geological Society, i. Hardman, Journal of the Royal Geological Society of Ireland, iv. 888 THE ]ÎRITISII ISLES. large a scale as in tlic mouutains bordering upon the Adriatic. Sometimes ithappens that the arch which covers one of the corroded hollows or channels givesway, and the chasm thus created may give birth to a lake, or lay open an under-ground river channel. It is thus that Lough Lena feeds both the Dell, a visibleatHuent of the Boyne, and an underground channel which communicates with ariver flowing into Lougli Eee. The great Lough Mask, Avhich fills a rock basinin Connemara, has apparently no outlet, except through an artificial canal connect-ing it with the still larger Lough Corrib. But on closer examination it hasbeen found that it is drained by an underground river, which reappears in copioussprings at Cong. These springs, which immediately give birth to a large river, Fig. 196.—The Underground Emissary of Lough 1 : 145, S-ao^Wo+Gr. Miles. were formerly held in high veneration, and an abbey was built by their lakes, similar in all respects to that of Zirknitz, in the Carso, are to bemet with in the fissured limestone region of Western Ireland. During summerthey retire into underground cavities, and sheep browse upon the herbage whichsprino-s up on their bed ; but soon the rainfall causes the hidden water to rise againto the surface, the lake bed is once more filled, and sometimes it even overflowsand inundates the country around. One of the turloughs, or winter lakes, ofGalway occasionally expands until it is 2 miles wide.* But whilst some lakes, owing to the erosive action of the water, are perpetually*- Willi im Hughes, Geography of the British Islands. IRELAND. 389 enlarging their area, others grow smaller, and in the end disappear altogether,although they receive the same amount of rain as before, and have not been of this kind are suc
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