My dear Sir

I am very much obliged for all the very interesting details in your letter.— I am particularly pleased to hear about the sexual colours in pigeons. Pray add to your kindness by hereafter telling me the sex of the single bird, & colours of any other pairs from 2 silvers.²

Thanks for photograph (which is a very good one of yourself)³

I do not quite understand whether the bird was uniformly coloured before exposure to strong lights.

You give D^r Bree a good thrashing; he is just what you call him “impertinent”: he in fact accused me, without a shadow of foundation, of lying, shortly after the publication of the Origin; he has not the soul of a gentleman in his body.⁴

I will send you with very great pleasure the last edit. of Origin, & have written to Murray; you can paste in enclosed, whenever you get the copy,⁵

With many thanks | Yours very sincerely | Ch. Darwin