Dear Sir.

Absence from home has prevented me from sooner thanking you sincerely for the present of your work on Fluids, & for your very kind note.¹ I have read the indicated passages, & your experiments seem to me to show, as far as I can judge on so difficult a subject and with my little knowledge that the course of Fluids under the stated circumstances would influence the nascent circulating system of an animal.—²

These experiments appear to me extremely curious—

With respect to the latter part of your letter. there can be no greater satisfaction to an old man, than to hear that what he has written has in the least degree influenced the taste for science in a young student.³ With all good wishes— | I remain | Dear Sir | Yours faithfully | Ch. Darwin.