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54 gradually, so that their habit of swimming to the shore when alarmed may, possibly, be due to a long-enduring ancestral instinct, having nothing to do with sharks.

We passed, whilst exploring one of these caverns, just beneath a ledge of rock, where a shag sat brooding over two tiny little things, but just hatched, perfectly naked, and jet black all over. This poor bird showed an anxiety which could hardly have been overpassed in the most devoted of human mothers, and I almost believe her sufferings were as great—for surely all extremities are equal. Her hoarse, bellowing cries reverberated through all the place, and helped, with the gloom, the murky light flung by our candles, the lurid colouring, and the deep, gurgling noises of the sea, to make a weird, Tartarean picture, difficult to excel. But it was not in sound alone that she vented her displeasure, for she was angry as well as alarmed. As the boat passed, she rose on the nest, and, in a frenzy of apprehension, snapped her bill, and alternately advanced and retreated her long, snake-like and darkly iridescent green neck. Though my head was but a foot or two away from her, she kept her place on the nest, and becoming more and more beside herself, behaved, at last, in such a manner as it is difficult to describe, but which upon the human plane and amongst the lower classes, is called "taking on." Not until I actually took up one of the young ones, to examine it—for this I could not resist—did she fling herself into the water, and then it was with a dramatic suddenness that looked like despair. It