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 in other respects—owing to its habit of laying its eggs on otherwise inaccessible ledges of the rock.

When three or four razorbills are swimming together, it is common for one of them to dive first, and for the rest to follow in quick succession, sometimes so quick that the order in which they go down, and the succession itself, can only just be followed. They must keep together under the water as well as above it, since they will often emerge so, after some time, and at a considerable distance.

The guillemot dives more or less like the razorbill, but I have not been successful in tracing him under the water.

There remains the puffin. "I have been able to follow the puffin downwards in its dive, and at once noticed that the legs, instead of being used, were trailed behind, as in flight, so that the bird's motion was a genuine flight through water, unassisted by the webbed feet. With the razorbill, I was not able to make this out so clearly, for the legs are black, and the eye cannot detect them under the water, as it can the bright vermilion ones of the puffin (one wonders, by the way, if the latter play any part under water such as the white tail of the rabbit is supposed to do on land), though I could see that just in diving they were brought together and raised, so as to extend backwards in the same way. Penguins also trail the legs like this in diving, only giving an occasional paddle with them, whilst the wings are in constant motion."

It would seem, therefore, that those diving birds which swim with their wings under the water only use their feet in a minor degree, and that they go down with a quick, sudden duck, or bob, and in the