To get into its clutches under certain circumstances is no trifling matter, for it has the power of whisking people off through the air.
— from British Goblins: Welsh Folk-lore, Fairy Mythology, Legends and Traditions by Wirt Sikes

But for what reason the intelligible character generates such and such phenomena and exhibits such and such an empirical character under certain circumstances, it is beyond the power of our reason to decide.
— from The Critique of Pure Reason by Immanuel Kant

conditionally, provided, if, in case; if so, if so be, if it be so; depending on circumstances, in certain circumstances, under certain conditions; if it so happen, if it so turn out; in the event of; in such a contingency, in such a case, in such an event; provisionally, unless, without.
— from Roget's Thesaurus by Peter Mark Roget

Nevertheless, Rodman, as early as the year 1857, first drew attention to the fact that when metal is cast and then cooled, under certain conditions, internal stresses are necessarily developed; and these considerations led him, in the manufacture of cast iron guns, to cool the bore with water and to heat the outside of the moulds after casting.
— from Scientific American Supplement, No. 633, February 18, 1888 by Various

I could have pointed out to him that here was mute Nature explaining the sublime mystery of the Trinity so luminously—that even the commonest understanding could comprehend it, whereas many a trained master of words had labored to do it with speech and failed.
— from Mark Twain: A Biography. Volume III, Part 2: 1907-1910 by Albert Bigelow Paine

Of course, under certain conditions it might be wise to take account of the slightest influences.
— from McClure's Magazine, Vol. XXXI, No. 4, August 1908 by Various

Made in a certain mood, viewed through a certain temperament, conceived under certain conventions, it may be, it often is, an unreplaceable poem, a vision that may never be seen again.
— from The Victorian Age in Literature by G. K. (Gilbert Keith) Chesterton

"Sad occurrence," "nice young man," "brilliant prospects," "only son of—," and "promising talents," "laboring under incipient insanity," "fatal cause unknown," &c., &c. I sympathized with myself until near morning, then fell into a sleep, which lasted until the bell rung for breakfast.
— from Graham's Magazine Vol XXXIII No. 4 October 1848 by Various

The present magnificent crypt under Chartres Cathedral is the very one built by St. Fulbert.
— from How France Built Her Cathedrals: A Study in the Twelfth and Thirteenth Centuries by Elizabeth Boyle O'Reilly

When the chairman was appointed, and the regulations by which the meeting was to be guided, read and assented to by both parties, the melee commenced; and, indeed, we are bound to say, that a melancholy comment upon Christian charity it was.
— from Valentine M'Clutchy, The Irish Agent The Works of William Carleton, Volume Two by William Carleton

The subsequent changes undergone consist chiefly in the continued elongation and multiplication of the lens-fibres, with the partial disappearance of their nuclei.
— from The Works of Francis Maitland Balfour, Volume 3 (of 4) A Treatise on Comparative Embryology: Vertebrata by Francis M. (Francis Maitland) Balfour

Birth of Christianity—Its Dissemination—Persecution at Lyons by order of Marcus Aurelius—The Roman Empire Espouses Christianity under Constantine CHAPTER IV.
— from The Evolution of an Empire: A Brief Historical Sketch of France by Mary Platt Parmele