Although we are justified in saying that there can be no progress, no discovery in art, but only in the sciences, and that the artist who begins afresh upon his own account an individual effort cannot be either helped or hindered by the efforts of all the others, we must nevertheless admit that, in so far as art brings into prominence certain laws, once an industry has taken those laws and vulgarised them, the art that was first in the field loses, in retrospect, a little of its originality.