My dear D^r. Sanderson

Pray excuse me for troubling you but I am in a perplexity. My son tells me that D^r. Klein said that he would have the great kindness to send me a copy of your recent book on Histology and Physiology.² I do not know whether my son has blundered, but he understood that you were going to despatch it. On Thursday all books, parcels, &c received during the previous week at Down were brought up here by our weekly carrier, but your book was not there. I should be sorry to lose the book, and very much more sorry not to thank D^r. Klein. Will you be so kind as to give me any information on the subject. If it has been despatched, and should be lost (which is very unlikely) I will get a fresh copy and thank D^r. Klein just as if I had received it, so do not tell him.— Pray excuse me and let me have one line.— It is just possible that my son may have altogether misunderstood D^r. Klein, and that makes it the more impossible for me to write to him

Yours very sincerely | Ch. Darwin

I much enjoyed my talk with you and you did me a real good service about the Tumbler pigeon. I have thanked D^r. Brenton and returned the Gazette to him.³