Letter 775. To Herbert Spencer. Down, December 9th [1867].

I thank you very sincerely for your kind present of your "First Principles." (775/1. "This must have been the second edition." (Note by Mr. Spencer.)) I earnestly hope that before long I may have strength to study the work as it ought to be studied, for I am certain to find or re-find much that is deeply interesting. In many parts of your "Principles of Biology" I was fairly astonished at the prodigality of your original views. (775/2. See "Life and Letters," III., pages 55, 56.) Most of the chapters furnished suggestions for whole volumes of future researches. As I have heard that you have changed your residence, I am forced to address this to Messrs. Williams & Norgate; and for the same reason I gave some time ago the same address to Mr. Murray for a copy of my book on variation, etc., which is now finished, but delayed by the index-maker.