The peculiar opaqueness necessary for the X-ray is obtained by administering to a patient, who is in a fasting condition, two ounces of bismuth subcarbonate mixed with two glasses of buttermilk. Many radiographs are then made in rapid succession. These are reduced to cinematographic size and projected upon a screen, giving a very graphic representation of the motions of the stomach during digestion. The films used in this paper were made by Dr. Lewis Gregory Cole, Radiologist to Cornell University Medical College, and were shown at a recent meeting of the American Medical Association, and published in the journal of that society and in the Archives of Roentgen Ray. This procedure is termed “Roentgencinematography” by Kaestle, Rieder, and Rosenthal, to whom Dr. Cole gives much credit for previous work along the same line. In the articles referred to above Dr. Cole advises this method of examination for determining the presence of cancers and ulcers of the stomach. [Illustration: Produced by Thomas A. Edison, Inc. SCENE FROM “THE STARS AND THE STRIPES” This picture shows the surrender of the British captain to John Paul Jones in the famous fight between the _Bonhomme Richard_ and the _Serapis_. The scene was arranged in the Edison Studio, the American ship being stationary and the other arranged to run on rollers.] “Photographing time” has a spectacular sound, yet patents were recently issued to the writer which virtually accomplished this. Between the shutter and the film of the moving-picture machine are introduced the marked edges of revolving transparent dials, actuated by clock-movement. The figures in the three dials denote the hour, minute, second, and smaller divisions, and are arranged to come to a prescribed position as the shutter opens. By this means the exact time at which any motion is photographed is imprinted on the different pictures of the film independent of the varying speed of the hand-crank. Such records promise to be most useful in the “scientific management” field and medical pictures, from which comparative time studies can be made from a number of films at the same time or from a single film by reproducing it on the screen in the usual manner. Over twenty years ago, Mr. Edison stated in his patent specification in referring to his ability to take forty-six photographs per second, “I have also been able to hold the tape at rest for nine tenths of the time.” It was probably not intended to convey the impression that he could take anything approaching ten times the number of pictures, as it is of course necessary to provide for rest periods; but it is significant that very recently a machine has been perfected for portraying such rapid motion as projectiles in flight, etc., which takes the almost inconceivable number of two hundred and fifty pictures per second. Indeed, experiments are in progress which promise even four hundred per second.