My dear Romanes

One line to thank you for your letter, which I sh^d. have been very sorry if it had been shortened by a single line.—²

Your remarks on consciousness & self-consciousness seem to me very good.—³ I do not at all know what I shall make of the subject, & sh^d. not be in the least surprised if I come to the conclusion that I have worked for several weeks quite uselessly.— Some months ago I tried to make out about experience, & the result indicated that worms do learn, but from causes too long here to explain I dare not trust my observations.— I intend to have another attempt to eliminate the source of doubt, but Heaven only knows whether I shall succeed.—

It was very good of you to write so fully & so clearly.—

Ever yours sincerely | Ch. Darwin