Relates some observations on the expression of elephants; they do not cry unless the eye is hurt or struck. "Perhaps Mr Darwin will like to know the above."

Beginning of extract from William Dell Hartman’s "Journal of the doings of Cic[ada?] septemdecim" [unidentified] in Pennsylvania in 1851.

Writes on various observations and discoveries on dimorphic and trimorphic plants.

Thanks SN for the reference about the reindeer, received via Hooker.

CD wishes to ascertain whether there is any relation between the period of development of a character and its transmission to one sex alone.

No summary available.

Thanks BDW for extracts about "drumming" [of male Cicada to attract females].

Asa Gray and Hooker doubt that 13–year and 17–year Cicada forms should be considered distinct species. CD is inclined to agree with them.

Suggests observations be made of ratio of females to males in the rarer form.