My dear M^r Sclater

I am going to beg a favour of you which will cost you little trouble proportionally to the great service it will be to me.— I have a most unfortunate weakness, though I strive against it, to copy proper names incorrectly. In my present book on sexual difference I have to give a host of names of Birds.² Will you run your eye over the enclosed list & see that names are spelt rightly?— I enclose envelope addressed to save you as much trouble as possible.— You can return the list without a word; except indeed, if you will add that I may send another list for another one or two chapters.—³ I have checked all names occurring in books which I possess (except one or two just now mislaid) but I have not Jerdon or the Ibis from which many names are taken.⁴

I hope & think this will not cause you much trouble.

Yours very sincerely | Ch. Darwin