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1. If two geometrical series of numbers, having the same common ratio, be placed in order with the terms opposite each other; the ratio, between any term in one series and its opposite in the other, will be constant. 2. And likewise the ratio of a term in one series to any term in the other, will be the same as obtains between any other two terms having he same relative position. and distance.

philosophical transactions of the royal society of london

XXIII. The principles and illustration of an advantages method of arranging the difference of logarithms, on lines graduated for the purpose of computation