The reason for this was apparent as one came to the bottom of the valley, for only a few yards on the left began the stretch of rough, reedy tussocks, with slobbering black bog between them, in which anything heavier than a water-wagtail would speedily suffer change to a succession of little bubbles. Wimsey stooped for an empty sardine-tin which lay, horridly battered, at his feet, and slung it idly into the quag. It struck the surface with a noise like a wet kiss, and vanished instantly. With that instinct which prompts one, when depressed, to wallow in every circumstance of gloom, Peter leaned sadly upon the hurdles and abandoned himself to a variety of shallow considerations upon (1) The vanity of human wishes; (2) Mutability; (3) First love; (4) The decay of idealism; (5) The aftermath of the Great war; (6) Birth-control; and (7) The fallacy of free-will.