Charles Darwin an Ernst Haeckel, Down, 12. Februar 1880
DOWN, | BECKENHAM, KENT. | RAILWAY STATION | ORPINGTON. S. E. R.
Feb. 12th 1880
My dear Häckel
I thank you cordially for your letter, – one of the kindest which I have received in my lifetime. As I have much to do will write no more. –
Your ever true friend