My dear Sir

You will see by this address where we are and where we remain all this month. My health got so bad that I could do nothing at Down and we came here for a change of air; but though the views are delightful and air admirable, as yet it has done me no good, and I am fit for nothing.

Very many thanks for your interesting letter. I am glad to have the confirmation of the lamb case and to hear about the insects and Swifts.² How wonderfully complex the action and reaction of the elements and all organic beings are, and what a fine field for observation.

I have had an answer from M^r. Swaysland of Brighton and he most fully confirms about the males of our migratory Birds; he has never known an instance of the females arriving first.³

Once again let me thank you for your interesting letter, and believe me | My dear Sir | Yours very sincerely | Ch. Darwin.