Let photography quickly enrich the traveller's album, and restore to his eyes the precision his memory may lack; let it adorn the library of the naturalist, magnify microscopic insects, even strengthen, with a few facts, the hypotheses of the astronomer; let it, in short, be the secretary and record-keeper of whomsoever needs absolute material accuracy for professional reasons. So far so good. Let it save crumbling ruins from oblivion, books, engravings, and manuscripts, the prey of time, all those precious things, vowed to dissolution, which crave a place in the archives of our memories; in all these things, photography will deserve our thanks and applause. But if once it be allowed to impinge on the sphere of the intangible and the imaginary, on anything that has value solely because man adds something to it from his soul, then woe betide us!