To W. E. Darwin   9 January [1872]

My dear William

I received this morning the last proof, & I must thank you cordially for all the labour & anxiety, which you have saved & for all grinding work which you have yourself undergone.—¹ In one page a whole line had got misplaced, which I see had puzzled you & at first confounded me.—

I shall not want the Preface, Index &c looked over by you, so that your work is finally done.—

I am so glad we shall see you on Sunday.

Yours affectionately | C. Darwin