To F. G. Stokes   16 July [1878]

Dear Sir

Through reflexion & by reading what little has been written on subject, I do not doubt but that you will find interesting points to observe.—¹ I can think of only one point, & the possibility of attending to this will depend on your possessing an accurate musical ear, namely the various intonations, which young children utter, before they can speak, & just after they have learned to do so.— Many of their sounds in different notes are highly expressive.

Dear Sir | Yours faithfully | Ch. Darwin