"The doctrine of proportion, as laid down in the fifth book of Euclid, is, probably, still unsurpassed as a masterpiece of exact reasoning; although the cumbrousness of the forms of expression which were adopted in the old geometry has led to the total exclusion of this part of the elements from the ordinary course of geometrical education. A zealous defender of Euclid might add with truth that the gap thus created in the elementary teaching of mathematics has never been adequately supplied."
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Henry John Stephen Smith, Presidential Address British Association for the Advancement of Science, (1873); Nature, Vol. 8, p. 451. Reported in Moritz (1914)
https://en.wikiquote.org/wiki/Euclid%E2%80%99s_Elements
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Euclid’s Elements
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