In his letter to Theo, from Cuesmes, 24 September 1880 - original manuscript of letter no. 158 - at Van Gogh Museum, location Amsterdam - inv. no. b156 V/1962, http://vangoghletters.org/vg/letters/let158/letter.html
Van Gogh's copies (drawings) he made after the work of Rousseau have been lost
1880s, 1880
Context: First and foremost, the masterly etching, 'The bush', by Daubigny/Ruisdael. [ Daubigny's etching 'The bush', he made after Jacob van Ruisdael ].... I plan to do two drawings, either in sepia or something else, one of them after this etching [by Daubigny] — the other [etching, made] after T. Rousseau's 'The oven in Les Landes'. This latter sepia is already done — it's true — but if you compare it with Daubigny's etching, you'll understand that it becomes weak, even though the sepia drawing considered on its own may very well have a certain tone and sentiment. I have to go back to it and work on it again.... I couldn't tell you how happy I feel to have taken up drawing again. It had already been on my mind for a long time, but I always saw the thing as impossible and beyond my reach.
