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[35] But it is not without good reason that some of the greatest men have devoted special attention to this science. Geometry has two divisions; one is concerned with numbers, the other with figures. Now knowledge of the former is a necessity not merely to the orator, but to any one who has had even an elementary education. Such knowledge is frequently required in actual cases, in which a speaker is regarded as deficient in education, I will not say if he hesitates in making a calculation, but even if he contradicts the calculation which he states in words by making an uncertain or inappropriate gesture with his fingers.1 Again linear geometry is frequently required in cases, as in lawsuits about boundaries and measurements.

1 There was a separate symbol for each number, depending on the hand used and the position of the fingers. See Class. Review, 1911, p. 72

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load focus Introduction (Harold Edgeworth Butler, 1920)
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