My dear Sir

You are always most kind. The photographs are very curious and show great power of acting; but still I think that I should have known that the expressions were acted, if I had not read your letter first. If you will not think me unreasonable I should like to see the remaining ones.² Prof. Ferrier’s researches sound most wonderful and interesting. There is nothing like impudence in the world, and I hope that you will add to your kindness by sending me a copy of his paper when published.³ I shall be very curious to learn whether he believes that he excites an idea and that this leads to the movements, or that he acts directly on the motor nerves.⁴

With many thanks | Yours very sincerely | Ch. Darwin