Signed inverted by the artist in the negative in lower left.
The cliché verre process employs glass as a negative for a drawing. The plate is covered with an opaque substance like paint or smoke and then scratched through to the glass much like an etching plate. This plate is then used as a negative and contact printed or enlarged onto a sheet of light-sensitive paper. The process was perfected circa 1853 by the French photographer EugÞne Cuvelier (1837 - 1900) and used by painters of the Arras and Barbizon schools including Cuvelier's friend Corot, Daubigny, Rousseau and Millet between 1853 and 1874. Variants of the process were used in the 20th century by the Paul Klee, Man Ray and György Kepes.
