"When this truth shall be recognized and possessed in its fulness as it was by the Greeks (whom we indeed copy, but in that literal manner which the Greeks would have despised), then, and only then, will a study of the imitation of visible nature hold its true position as singly the most powerful ally of all other studies whatever. For what art or science, with the exception of music or mathematics, and what polite or useful calling in life, is not aided by increased accuracy of eye?" (60)
Like Ruskin (whom he often seems to follow but never mentions in his published work), Tupper finds essential connections among art, education, and the conditions of life in society; so, like Ruskin, he begins by writing about art and proceeds to comment upon society.
Part I of "The Subject in Art" may be found here.