... The earth,trampled by the feet of horses and men, gave no clew... 
Edgar Rice Burroughs 「Tarzan and the Jewels of Opar」
...The order was given to clew up the courses and take a reef in the topsails...
W.H.G. Kingston 「The Two Supercargoes」
...And so the mechanics of a skeleton affordus a clew to the habits of the living animal...
Frederic A. Lucas 「Animals of the Past」
...“Ah, who shall lift that wand of magic power,And the lost clew regain?The unfinished window in Aladdin’s towerUnfinished must remain...
Jennie Ellis Keysor 「Great Artists, Vol 1.」
...We have now to note a peculiarity ofthese zones which ought to furnish a clew to the sun'smechanism, although up to the present time it has notbeen successfully traced out...
George C. Comstock 「A Text-Book of Astronomy」
...Riches are the symbols of the great majority of the benefits of this life; they become a reality in the hands of the man who has the clew to their just application...
Paul Henri Thiery (Baron D'Holbach) 「The System of Nature, Volume 1」
...This idea of the sun as a developing body whose presentstate is only temporary, furnishes a clew to some of thevexing problems of solar physics...
George C. Comstock 「A Text-Book of Astronomy」
...It blew so strong as to make it necessary to clew down all the sails; and until next morning [SATURDAY AUGUST 8], nothing above close-reefed top sails could be carried with safety...
Matthew Flinders 「A Voyage to Terra Australis」
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