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Updated: October 23, 2026
David Stair Jordan at Penikese, in the summer of 1873, from Agassiz's talks to teachers; see Popular Science Monthly 40. 726-727, and Holder, Louis Agassiz, his Life and Works, 1893, pp. 173-176. Never try to teach what you yourself do not know, and know well. If your school board insists on your teaching anything and everything, decline firmly to do it.