Is drawing up the account of his crossing experiments. Requests JDH to add the families after nine genera, the names of which he encloses. Whenever there is no objection he would like to arrange the families in some sort of natural order.

Recommends Spalding’s article on instinct in Macmillan’s Magazine [27 (1873): 265–81].

Is glad JLGK has been interested in Descent.

Thanks him for his observations on monkey behaviour [see 8698]

and drawings of skulls, which CD has sent to George Busk.