"My next object is to photograph the bones of the entire leg," continued Herr Spies. "I anticipate no difficulty, though it requires some thought in manipulation." It will be seen that the Röntgen rays and their marvellous practical possibilities are still in their infancy. The first successful modification of the action of the rays so that the varying densities of bodily organs will enable them to be photographed, will bring all such morbid growths as tumors and cancers into the photographic field, to say nothing of vital organs which may be abnormally developed or degenerate. How much this means to medical and surgical practice it requires little imagination to conceive. Diagnosis, long a painfully uncertain science, has received an unexpected and wonderful assistant; and how greatly the world will benefit thereby, how much pain will be saved, and how many lives saved, the future can only determine. In science a new door has been opened where none was known to exist, and a side-light on phenomena has appeared, of which the results may prove as penetrating and astonishing as the Röntgen rays themselves. The most agreeable feature of the discovery is the opportunity it gives for other hands to help; and the work of these hands will add many new words to the dictionaries, many new facts to science, and, in the years long ahead of us, fill many more volumes than there are paragraphs in this brief and imperfect account. THE RÖNTGEN RAYS IN AMERICA. BY CLEVELAND MOFFETT. At the top of the great Sloane laboratory of Yale University, in an experimenting room lined with curious apparatus, I found Professor Arthur W. Wright experimenting with the wonderful Röntgen rays. Professor Wright, a small, low-voiced man, of modest manner, has achieved, in his experiments in photographing through solid substances, some of the most interesting and remarkable results thus far attained in this country. His success is, no doubt, largely due to the fact that for years he had been experimenting constantly with vacuum tubes similar to the Crookes tubes used in producing the cathode rays. When I arrived, Professor Wright was at work with a Crookes tube, nearly spherical in shape, and about five inches in diameter--the one with which he has taken all his shadow pictures. His best results have been obtained with long exposures--an hour or an hour and a half--and he regards it as of the first importance that the objects through which the Röntgen rays are to be projected be placed as near as possible to the sensitized plate.