Dear Ramsay

I must write a line to say how sincerely rejoiced I am to hear that your health is nearly reestablished. I remember Sir H. Holland telling me that a gradual & slow recovery of health was always better than a sudden jump.² I am extremely much pleased to hear that you like my Book. I look at every geological believer of the mutation of species as a most important gain.— There will be a long & stiff battle before such doctrines are generally admitted. The progress of subject will now depend far more on such men as yourself than on anything I can do.—

You put, as it seems to me, the general arguments against the eternal immutability of species with great clearness.—

With very sincere thanks for your note. | Believe me | Yours very truly | C. Darwin

I hope to be in London in a day or two & will call at Museum for chance of seeing you.—³