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322 of causing them to fly. There were hundreds of nests, and the birds not sitting kept flying in front of the rock, passing and repassing so long as any thing remained to disturb them. On approaching this resort, and also at a similar, but smaller, one on St. Bee's Head, few of the birds quitted the rock ; but at the surprise of our first shots, they fell, as it were, or darted straight to the water, some of them close to the boat, so much so as at first to cause us to think that great havoc had been made ; in which we were soon undeceived, by seeing numerous heads appearing at a distance, and the birds immediately making off in safety. They soon, however, learned to sit and look down in content, though at new stations we procured specimens by one firing at the rock, and another taking the birds as they darted to the water. Caves are also resorted to as breeding places by this bird, on the ledges of which the nest is placed. On the Bass Rock, and the Isle of May, where only a few resort, they select the deep caves : and a boat, stationed at the entrance, but out of sight, may some times procure shots at the disturbed birds flying out, although they more frequently dive into the water of the cave, and swim under until far past the entrance."

As an example of the great depth to which marine diving birds will descend in pursuit of prey, Mr. Yarrell mentions that the Shag has been caught in a crab-pot fixed at twenty fathoms, or one hundred and twenty feet below the surface.

We may here allude to some observations by