But by heating the bottom of "a sheet-iron box, with its ends cut away," the rarefied air at the bottom of the box may sometimes be made to yield reflections; and this shows at least that the supposed cause is a possible one (Deschanel, Optics, § 726).
— from Logic: Deductive and Inductive by Carveth Read

"History, like every science, consists in a process of discerning facts, analysing them, comparing them, and noting their connections....
— from Introduction to the Study of History by Charles Seignobos