"Those persons who desire to see the doctrine of Proportion treated according to a general method which is plainer than Euclid's, and equally accurate, may consult the geometry of Playfair, [Alexander] Ingram, Leslie, Cresswell, and J. R. Young. Hutton, and other recent writers have adopted the algebraical method in their elements of geometry. Proportion is not properly a geometrical subject."
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Francis Nichols, Elements of Geometry being Chiefly a Selection from Playfair's Geometry, with Additions and Improvements (1829)
https://en.wikiquote.org/wiki/Doctrine_of_proportion_(mathematics)
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Doctrine of proportion (mathematics)
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