To G. R. Gray   [February–March 1841]

My dear Sir

Will you oblige me by looking over the proof of the index, & just marking any error you may observe.— It is such an interminable job to compare every name with text & your memory probably is far more accurate than mine.—

I will send proof of your Errata, soon—

If any of the Specimens of Birds are at hand the Bearer may as well bring some back

Yours most sincerely | Chas. Darwin