"But a more tangible result and one to which I attach the greatest importance was obtained by examining the screen by means of a revolving mirror. It is well known that, if our ordinary cinematographic pictures projected on a screen be viewed in a mirror to which we impart a rapid rotary movement, the successive pictures are dislocated and yield images in the field of the mirror. A similar effect can be obtained, though less distinctly, by turning one's head quickly so as to project the successive pictures upon different points of the retina. It was therefore indicated that I should apply this method of analysis to the animated projections produced at Meudon. I was thus able to prove positively that these projections, like those of the ordinary cinematograph, break up into separate and successive images, but with a rapidity which is notably greater than in the operations to which we are accustomed, for I found that they average 28 to the second. On the other hand, these images are not emitted at regular intervals. I observed rhythmical alterations of acceleration and retardation and I am inclined to believe that the rhythmical variations are not unconnected with the extraordinary impression of steroscopic relief which all the spectators at Meudon received. "The foregoing observations led up to a scientific certainty and naturally guided my investigations into a definite channel: the Meudon pictures are genuine cinematographic projections thrown upon the screen and perceived by the spectators in the ordinary manner. But where is the projecting-apparatus? How does it work? This is where the gravest difficulty lies, for hitherto no trace of an apparatus has been discovered, nor even the least clue to the existence of any apparatus whatever.