Practically speaking, the securing of true tones in a photograph depends entirely upon the exposure. - Arthur Hammond

...I would recommend the photographer to regard the focusing-screen of his camera as a space to be divided into a pleasing pattern, rather than as a glass on which a reduced facsimile of a scene or view or a miniature likeness of a person can be seen.

So photography, having a place among artistic processes, has its own distinguishing quality which cannot be duplicated by any other medium.

To learn to see pictorially is the first essential duty of the would-be picture-maker.