...Kitts to trepan him; and when all their attempts andschemes of kidnapping proved abortive, Mr... 
Olaudah Equiano 「The Interesting Narrative of the Life of Olaudah Equiano, Or Gustavus Vassa, The African」
...As thedivergence in sentiment became more and more pronounced,there were various attempts at legislation, all of whichproved abortive...
W. E. B. Du Bois 「The Suppression of the African Slave Trade to the United States of America」
... The scheme, which was rendered abortive by the continental war of 1793, had two remarkable results...
Richard F. Burton 「Two Trips to Gorilla Land and the Cataracts of the Congo Volume 2」
...There was no further plottingon any scale until the Haytian revolt, when Gabriel in Virginiamade an abortive attempt...
W.E.B. Du Bois 「The Negro」
...This Tubularia is interesting, however, from the fact that the Medusæ budsare never freed from the stem, and do not develop into full-grownJelly-fishes, but always remain abortive...
Elizabeth Cabot Cary Agassiz 「Seaside Studies in Natural History」
..." In several moths of this family the females have abortive wings, but no instance is known of the males being incapable of flight, for in this case the species could hardly have been perpetuated...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...On the crest,immediately above the beak, aretwo small, fleshy horns, resembling, tosome extent, an abortive comb...
Robert Jennings 「Sheep, Swine, and Poultry」
...More than a month all our endeavours were abortive...
Francis Huber Anonymous 「New observations on the natural history of bees」
...After several abortive attempts to secure him more effectually, he was allowed to wander freely about the ship, and soon became familiar with the sailors, and surpassed them in agility...
Samuel Griswold Goodrich 「Illustrative Anecdotes of the Animal Kingdom」
...When we attempt actually to weigh the comet, our effortshave proved abortive...
Robert Stawell Ball 「The Story of the Heavens」
...All thesemeans, however, had proved abortive, and he was now called upon tosupportthe doctrine which he had subscribed, and administer the law of which hewas the guardian...
David Brewster 「The Martyrs of Science, or, The lives of Galileo, Tycho Brahe, and Kepler」
...The fit of an ague, the consequence of bile a little too much inflamed, had sufficed, perhaps, to have rendered abortive all the vast projects, of the legislator of the Mussulmen...
Paul Henri Thiery (Baron D'Holbach) 「The System of Nature, Volume 1」
... What istheir history? Can they have been once a single planet broken up? or arethey rather an abortive attempt at a planet never yet formed into one?...
Oliver Lodge 「Pioneers of Science」
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