The Eternal March
The Eternal March is a letter written by Arthur Conan Doyle first published in the Daily Express No. 8862 on 22 september 1928.
The Eternal March

(From Sir A. Conan Doyle)
Sir, — There is no discrepancy at all between Mr. Longstaff's view of the origin of his picture. "The Eternal March," and my own. I have never thought that he was under obsession when he painted this picture — which to my mind, is one of the greatest in its world. But he was certainly under strong psychic mental influence.
He had been to a séance ; he had got into touch with a vanished friend who was an artist, he was full of that spiritual elation, which comes which come with conviction, and then within a few days he painted, working at great speed, a picture which depicts the whole fate of man as Spiritualists conceive it. Surely, you cannot disconnect these events.
A. CONAN DOYLE.
Bignell Wood, Hants.