John Ruskin “The stones of Venice (cont'd) Seven lamps of architecture. Lectures on architecture and painting, delivered at Edinburgh in Nov. 1853. An inquiry into some of the conditions at present affecting the study of architecture in our schools”
John Ruskin (1873). “The Eagle's Nest: Ten Lectures on the Relation of Natural Science to Art, Given Before the University of Oxford in Lent Term, 1872”, p.34