The plates of the present work are impressed by the agency of Light alone, without any aid from the artist's pencil.
Light acts chemically upon bodies. It is absorbed, it combines with them, and communicates new properties. Such, in a few words, is the principle of the discovery.
The examples that I have the honor of presenting are the first results of my extensive research on the manner of fixing the image of objects by the action of light.
Numerous experiments made by the author prove that light cannot fall upon a body without leaving traces of decomposition on the surface upon which it impinges.