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Published online by Cambridge University Press: 24 October 2008
1. Cremona's projection of 15 lines on a nodal cubic surface onto a plane π is a striking example of the resolution of a highly complicated figure into its constituent simplicities, for it explains, almost at a glance, so many properties of Pascal's mystic hexagram. These may appropriately be called ((12); (10), p. 162) the Veronese properties and have been described on several occasions ((12); (6); (10); (1), pp. 219–236; (2), pp. 349–355).