For a later working out of this note see Appendix 14 at Works, 9.444. See Appendix 13 at Works, 9.440 and the reference there to James Fergusson, An Historical Enquiry into the true principles of Beauty in Art, more especially with reference to Architecture, London: Murray 1849.
It is interesting that Ruskin was concerned throughout the notebooks with establishing methods of classification.
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[Version 0.05: May 2008]