Asks whether he may see CD before leaving England.
Asks whether he may see CD before leaving England.
Suggests time for AA to visit.
Instances of sexual differences in viviparous fishes, suggested by reading chapters on sexual selection [in Descent] and by Mivart’s Genesis of species.
Notes on echinoderms.
Discusses homologies in various animal groups.
Comments on Mivart [Genesis of species].
Thanks AA for a ‘splendid case of gradation of structure’.
Discusses exchange of books.
Thanks for new [6th] edition of Origin.
Is working on Echini.
The more material he gets the less easy it is to diagnose a genus or species. Has little doubt that "classification is nothing but the most arbitrary convenient tool, depending upon the material at our command at a special time".
Thanks for Expression.
Has lost a year’s work in the fire that has devastated Boston.