Dear Sir
You cannot know how much your note has pleased me.2 I am naturally, & I hope not only selfishly, deeply interested in the progress of opinion on the mutability of species. I have long been convinced that species will be held to be all aboriginal creations as long as the geological record is looked at as nearly perfect.3 Therefore you may believe with what high satisfaction I have read the remarks of one, who like yourself has large & practical knowledge of geology.4
He who can shake the general belief that we should be able to trace the mutation of species in our formations, if they (ie species) have changed, will I believe do high service to natural science; & this will be in your power.—
Again let me thank you for your note; though I was far from expecting that anyone would thank me for so trifling a present.—5
I have just finished correcting a new Edit. of the Origin with some additions, & I will do myself the pleasure of telling my Publisher to send you a copy, as soon as it is out.—6
Pray believe me | Dear Sir | Yours very faithfully | Charles Darwin
Please cite as “DCP-LETT-3073F,” in Ɛpsilon: The Charles Darwin Collection accessed on