...Before considering this, let us revert to thequestion of what constitutes a species... 
Edward Jesse 「Anecdotes of Dogs」
...With respect to colour, feral pigs generally revert to that of the wild boar; but in certain parts of S...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...Seedlings of this variety, like those of most varieties not fixed by long-continued selection, often revert to the ordinary form, or present intermediate states...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...To the Italian Renaissance we shall revert in alater chapter...
John W. Bradley 「Illuminated Manuscripts」
...) Now we must revert to Erec, whom we left in the field where the battle had taken place...
Chretien DeTroyes 「Four Arthurian Romances」
...Let us now revert to the Europeaneclipses...
George Chambers 「The Story of Eclipses」
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