... With Taglat there was another incentive—a secretand sinister incentive, which, had Tarzan of the Apes had knowledge ofit, would have sent him at the other's throat in jealous rage... 
Edgar Rice Burroughs 「Tarzan and the Jewels of Opar」
...Not justice, but social injustice isthe incentive of these worthy gentlemen...
Various 「Mother Earth, Vol. 1 No. 1, March 1906」
...He did not need any further incentive, butpushed on the nags with frantic exertion...
R. Lee 「Anecdotes of the Habits and Instinct of Animals」
...But their importance to the unletteredpeople of the Middle Ages cannot be overestimated; and the incentive tomagnificence of artistic conception was correspondingly great...
Elise Whitlock Rose 「Cathedrals and Cloisters of the South of France, Volume 1」
...In their relation, he gave everything in the way of incentive andinitiative, and she returned her entire effort loyally...
Edward Singleton Holden 「Sir William Herschel: His Life and Works」
...The problem as thus presented was one of the most difficult we canperceive of, but the difficulty was only an incentive to attacking itwith all the greater energy...
Simon Newcomb 「Side-lights on Astronomy and Kindred Fields of Popular Science」
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