Comments on his examination of slides [of milk casein?] sent by CD.

Surprised by CD’s finding that a drop of one per cent hydrochloric acid stops digestion of albumen by Drosera.

Sends his paper ["On secondary sexual characters in the Cheiroptera", Proc. Zool. Soc. Lond. (1873): 241–52]

and some of his observations of the gecko, which appear to contradict CD’s opinion.