marily of mathematics, but even so, it was some time before a system of computation was devised and the undertaking gotten down to a certainty. As an illustration, on the opening night of one of the most notable photoplay productions now before the public, the orchestra, notwithstanding a three weeks' rehearsal, found at the conclusion of the picture that it was a page and a half behind the play's action in the musical setting." Then we learn that Frank Stadler of New York "provided the remedy for this condition of affairs. He remembered that Beethoven had overcome the difficulty of proper timing for his sonatas by a mechanical arrangement known as the metronome, invented by a friend of his." Mr. Stadler then began the measurement of a film with a metronome, a stenographer, and a watch. He quickly discovered that the film ran ten feet to every eight seconds, and he accordingly set the metronome for eight-second periods. The stenographer made a note of the action of the picture each time the bell rang, with the result that when the entire picture had been run off Mr. Stadler had a complete record of the production. All that was necessary then was to select from the classics and the popular melodies the music which would give a suitable atmosphere and a harmonious accompaniment to the theme of the play, so
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