..." "What clue is here?" said Don Quixote... 
Miguel de Cervantes Saavedra 「The History of Don Quixote de la Mancha」
...“Nothing of importance,” she said, staring mechanically before her,“but it might prove a clue...
Baroness Orczy 「The Scarlet Pimpernel」
... Wolverstone, the only one who held the clue to this degeneration, ventured once—and once only—to beard him frankly about it...
Rafael Sabatini 「Captain Blood」
...Barring the episode of theransacking of my effects the first night, I had not a suspicion of a clue or ahint of any mystery...
John Buchan 「Mr. Standfast」
...“How can you know a mind whichhas no characteristics except that it is wholly and supremely competent? Meremental powers won’t give us a clue...
John Buchan 「Mr. Standfast」
...We have been on your track for three days, and yesterday evening an unguarded movement on the part of Sir Andrew Ffoulkes gave us the final clue to your whereabouts...
Baroness Orczy 「El Dorado」
... I had a clue and hadbeen on the look-out for mysteries, but that another should feel thestrangeness for himself made it seem desperately real to me...
John Buchan 「Prester John」
... It was as plain as daylight that we were in for somegrave trouble, trouble to which I believed that I alone held any kindof clue...
John Buchan 「Prester John」
... This was no sort of clue, and Iturned the thing over, completely baffled...
John Buchan 「Prester John」
...La Clue, who was inthe Ocean, an eighty-four gun ship: as we passed they all fired on us;and at one time three of them fired together, continuing to do so forsome time...
Olaudah Equiano 「The Interesting Narrative of the Life of Olaudah Equiano, Or Gustavus Vassa, The African」
...And, as usual with Colonel Clay, they vanishedinto space, leaving no clue behind them...
Grant Allen 「An African Millionaire」
...—The locality of this reserve cannotbe determined from the official description, which gives no clue toits shape or size...
William T. Hornaday 「Our Vanishing Wild Life」
...) The appearance of the casts gives some clue to the condition of thekidneys...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...It also kept his keen hearing from supplying any clue...
Albert Payson Terhune 「Bruce」
...Here, then, was a real clue...
Bradford Torrey 「The Foot-path Way」
...” While drumming the birdcontrives to make himself invisible,and if seen it is difficult to get theslightest clue to the manner in whichthe sound is produced...
Various 「Birds Illustrated by Color Photography [June, 1897]」
...A clue to the mysteryis perhaps supplied by the Vestal fire which burned in the grove...
Sir James George Frazer 「The Golden Bough」
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