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Use "indagation" in a sentence
"Yet he exhorted the true “naturalist” not to “let the search or knowledge of final causes make him neglect the industrious indagation [i.e., investigation] of effi - cients,” and he implied that the naturalist's principal aim was the discovery of efficient causes."
"It was not discovered by the severe indagation and watchfulness of ministers of state from foreign intelligence, -- the usual way of discovering such plots."
"Hence things philosophical, and of a deep rational indagation, find great acceptance in the world — as, in their proper place, they do deserve."