...That thesefish could cut through four inches of steel was not so improbable asit sounded... 
Various 「Astounding Stories, August, 1931」
...His first thought, of course, was of escape, but that he could make hisway to the surface of the river beyond and then to the shore seemedhighly improbable...
Edgar Rice Burroughs 「The Beasts of Tarzan」
... He saw that these twowere standing with their back toward him and between him and thebalance of the tribe, and he guessed, though it seemed improbable, thatthey might be defending him...
Edgar Rice Burroughs 「Jungle Tales of Tarzan」
...Some things in it require explanation, but the numbers of animals said to have been met with and killed are by no means improbable, considering the amount of large game then in the country...
David Livingstone 「Missionary Travels and Researches in South Africa」
...The results of its administration are so peculiar,however, and so entirely improbable, that one is supposed to doubt eventhe initial use of poison, and figure it in as part of the same generaldelusion...
Charles W. Chesnutt 「The Conjure Woman」
...The story of the nursing is not improbable, forwell-known instances have been recorded of the feræ, whendeprived of their young, adopting young animals, even of those onwhom they usually prey...
Robert A. Sterndale 「Natural History of the Mammalia of India and Ceylon」
...That any livemammoth has for centuries been seen on theAlaskan tundras is utterly improbable, and onMr...
Frederic A. Lucas 「Animals of the Past」
...We thus see that the European and American species can with some difficulty be crossed; but it is improbable that hybrids sufficiently fertile to be worth cultivation will ever be thus produced...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...Thedanger of the study must excuse our ignorance; nor is this much to beregretted, since it is highly improbable that medicine could cure what isso deeply seated and universally present...
Dinks, Mayhew, and Hutchinson 「The Dog」
...The first objection is that it is improbable...
Fannie Hardy Eckstorm 「The Woodpeckers」
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