that among those who do some manufacture an atmosphere of their own, while others try to render nature’s atmosphere, let us study for ourselves the effect of atmosphere in nature. It will help us, if I begin by telling what we expect to find. First then, that the outlines of objects are softened; secondly, that the bulk of things seems flattened; and thirdly, that as objects recede or stand further off from our eyes, their forms becomes more and more indistinct and their colors change.