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 they see her lovely shoulders because of the red costume she wore.

They were just on the point of feeling their inspection had reached the limit of really nice manners and Mabel was pretending to go on splashing again and saying to Betty, "She's wearing a red dress. I wish I could see—" when something very terrible happened.

The swimmer gave a queer sort of flop in the water, threw up her arms and—vanished!

It was the sort of thing that seems for an instant to freeze everybody, just one of those things that everyone has read of and imagined and very few people have seen.

For a space no one did anything. One, two, three seconds passed and then for an instant a bare arm flashed in the air and vanished again.

Mabel tells me she was quite paralysed