Any study of this topic must evidently turn on the question how far at different times and by different schools of thought the realm of man and the realm of nature (as Byron uses the word) have been separated and in what way, and also how far they have been run together and in what way. For there may be different ways of running together man and nature. Ruskin’s phrase the “pathetic fallacy” is unsatisfactory because it fails to recognize this fact. The man who is guilty of the pathetic fallacy sees in nature emotions that are not really there but only in himself. Extreme examples of this confusion abound in Ruskin’s own writings. Now the ancients also ran man and nature together, but in an entirely different way. The Greek we are told never saw the oak tree without at the same time seeing the dryad. There is in this and similar associations a sort of overflow of the human realm upon the forms of outer nature whereas the Rousseauist instead of bestowing imaginatively upon the oak tree a conscious life and an image akin to his own and so lifting it up to his level, would, if he could, become an oak tree and so enjoy its unconscious and vegetative felicity. The Greek, one may say, humanized nature; the Rousseauist naturalizes man. Rousseau’s great discovery was revery; and revery is just this imaginative melting of man into outer nature. If the ancients failed to develop in a marked degree this art of revery, it was not because they lacked naturalists. Both Stoics and Epicureans, the two main varieties of naturalists with which classical antiquity was familiar, inclined to affirm the ultimate identity of the human and the natural order. But both Stoics and Epicureans would have found it hard to understand the indifference to the intellect and its activities that Rousseauistic revery implies. The Stoics to be sure employed the intellect on an impossible and disheartening task--that of founding on the natural order virtues that the natural order does not give. The Epicureans remind one rather in much of their intellectual activity of the modern man of science. But the Epicurean was less prone than the man of science to look on man as the mere passive creature of environment. The views of the man of science about the springs of conduct often seem to coincide rather closely with those of Rousseau about “sensitive morality.” Geoffroy Saint-Hilaire says that when reclining on the banks of the Nile he felt awakening within himself the instincts of the crocodile. The point of view is Rousseauistic perhaps rather than genuinely scientific. An Epicurus or a Lucretius would, we are probably safe in assuming, have been disquieted by any such surrender to the subrational, by any such encroachment of the powers of the unconscious upon conscious control.