163

O.51

the inquirer's making up a sample of a given class of objects, say the Ms, the exact number of the objects in the sample having been determined upon before the first was drawn, by successively drawing single Ms from the entire class under every possible precaution, equally against his being in any way, directly or indirectly, influenced toward taking an M into the sample by the fact of its possessing one certain character, say that of being P, this character having been predesignate antecedently to any drawing, and against his being influenced in the contrary way; and then after the sample has been comple-

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