Thanks for presentation copy of Descent.
Mivart’s Genesis of species [1871] is poor.
Mathematical illustrations of Pangenesis at Cambridge.
Wallace’s address on Madeira not convincing ["The President’s Address", Trans. R. Entomol. Soc. Lond. (1870): xliv–lxix; A. R. Wallace, Studies scientific and social (1900) 1: 250–66].