 I would like to thank Amanda Favia, Oliver Marshall, Frank Pupa and Rosemary Twomey for helpful comments on an earlier draft. Thanks also to Ben Caplan for helping sort out the date of Jones’s 1910 lecture to the Cambridge Moral Sciences Club. I remain indebted to Kenneth Blackwell, Rosalind Carey, Juliet Floyd, Nicholas Griffin, Kevin Klement and Consuelo Preti for their help on the first version. 