I have dwelt on his [Gainsborough's] early works, since picture-dealers.. ..always decry them, and say he never painted a picture fit to be seen till he left Suffolk - men who, place them in the green fields, cannot tell one tree from another. It is true his early works are less artificial and less academical, but they are far truer to nature, to elevated nature. His early pictures exhibit a remarkable variety of form in his trees; his oaks are inimitable; latterly, all his trees assumed one form; for he mistook system for nature.