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In the March number of the Red and Blue, of the University of Pennsylvania, is given an account of Roentgen photography and some experiments made at the university in the same direction by Dr. Arthur W. Goodspeed, assistant professor of physics. These experiments were successful repetitions of the experiments of Roentgen and others, together with original work ; but the item of greatest interest was contained in the last clause of the article referred to, which we produce, together with cut ofjthefirst shadow picture, for which we are indebted to the magazine above mentioned. In the year 1890, Mr. Jennings, of Philadelphia, had associated himself with Dr. Goodspeed in experiments on spark photography. One evening, the 22d of February, 1890, at the close of work, with the table still littered by plate holders and apparatus, Dr. Goodspeed brought out the Crookes tubes for Mr. Jennings' amusement. Next day that gentleman wrote that he had had a curious failure among his platesa negative spotted by two disks; but since no one could explain the phenomenon, comparatively uninteresting as it was, the plate was thrown aside and forgotten Six years later after the discovery of the Roentgen rays, it was recalled to mind and recovered. A duplicate was prepared under. exactly the same circumstances ; both plates exhibited the same indications of genuinenessthe sharp line at one edge of the disk, the dull line of shadow at the farther edge. These photographs the Red and Blue has the honor of presenting for the first time. It was in a lecture on the evening of University Day that Dr. Goodspeed told the story, and concluded thus: "We can claim no merit for the discoveryfor no discoverv was made. All we ask is that you remember, gentlemen, that six years ago, day for day, the first picture in the world by cathodic ray was taken in the Physical Laboratory of the University of Pennsylvania." DR. CHANTEMESSE, of Paris, has it is said discovered an anti-typhoid serum, with which he has experimented on three patients. After the first hypodermic injection they passed th rough the ordinary stages of the disease and became convalescent.
