As in summer the grass grew high on the bank [in the Seine] and prevented Seurat from seeing the boat which he had put in the very forefront - and he complained of this mischance - I helped him by cutting the grass; for I was almost certain that he was going to sacrifice the boat. Although he was not the slave of nature, he was respectful of it, for he was not imaginative. His concern centered most of all on tints, tones and their interactions.