My dear Sir

I am very much obliged for the beautiful photograph.¹ There is certainly a marked difference between the two sides of the face, but the only difference in expression that I can recognise, is that one side looks a little less devout. As you have attended so closely to differences on the sides of the face, shall I not return the photo— If so send me a post card.² I read a few days ago with extraordinary interest your remarkable article on Inhibition.³ How wonderfully complex the nervous system is! I arrived at one side-conclusion, viz that you, & not I, ought to have written my book on Expression.

My dear Sir | yours very sincerely | Ch. Darwin