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 have never known him to have it except when there was some evil quite near."

"Oh, rats!" said the scientist.

"Why, look at it," cried Father Brown, holding out the crooked knife at arm's length, as if it were some glittering snake. "Don't you see it is the wrong shape? Don't you see that it has no hearty and plain purpose? It does not point like a spear. It does not sweep like a scythe. It does not look like a weapon. It looks like an instrument of torture."

"Well, as you don't seem to like it," said the jolly Harris, "it had better be taken back to its owner. Haven't we come to the end of this confounded conservatory yet? This house is the wrong shape, if you like."

"You don't understand," said Father Brown, shaking his head. "The shape of this house is quaint—it is even laughable. But there is nothing wrong about it."

As they spoke they came round the curve of glass that ended the conservatory, an uninterrupted curve, for there was neither door nor window by which to enter at that end. The glass, however, was clear, and the sun still bright, though beginning to set; and they could see not only the flamboyant blossoms inside, but the frail figure of the poet in a brown velvet coat lying languidly on the sofa, having, apparently, fallen half asleep over a book. He was a pale, slight man, with loose,