I was spending an evening last week with my friend Mr.John Stuart Mill, and I am sure you will be pleased to hear from such an authority that he considers that your reasoning throughout is in the most exact accordance with the strict principles of logic.

He also says the method of investigation you have followed is the only one proper to such a subject.
It is easy for an antagonistic reviewer, when he finds it difficult to answer your arguments, to attempt to dispose of the whole matter by uttering some such commonplace as "This is not a Baconian induction." I expect shortly to be spending a few days in your neighbourhood, and if I should not be intruding upon you, I should esteem it a great favour if you will allow me to call on you, and have half an hour's conversation with you.
As far as I am personally concerned, I am sure I ought to be grateful to you, for since my accident nothing has given me so much pleasure as the perusal of your book.

Such studies are now a great resource to me.
LETTER 130.

TO C.LYELL.2, Hesketh Terrace, Torquay [August 2nd, 1861].
I declare that you read the reviews on the "Origin" more carefully than I do.

I agree with all your remarks.