Louis BLANC (1811-1882). P.A.S., London January 8, 1862; 1 oblong page in-8, framed with an engraved portrait. "Remarkable thing! When the triumph of an idea has become necessary in the world, that idea is found to hatch, as if by magic, in several brains at once. When Guttemberg invented the printing press, the same discovery was being made simultaneously in various parts of Europe [...]. It is that indeed, the right and great ideas belong to the human mind. To tell the truth, it is not the individuals who think, it is the societies. A thinker is only an echo: does the sound belong to the echo? " Attached is a L.A.S. to Victor Hugo, June 15, 1873, about Clément Dulac's financial difficulties after the exile (2 pages and a half in-8, framed).