Doubleday, H. S.

H. S. Doubleday an Ernst Haeckel, Sunderland, 19. Februar 1903

c/o 17 Nelson Street,

Sunderland,

England,

Feb 19, 1903

To Professor Haeckel,

Jena University.

Dear Sir,

Please excuse the liberty I have taken of addressing you, but I feel it my duty to write as a private student to thank you for writing such a book as the Riddle of the Universe. No other book that I have read has so profoundly interested me, and has shed so much light on the subjects I am studying.

Yours gratefully

H. S. Doubleday