The new method is a great step in advance in the line of precision of diagnosis, and, therefore, of correct treatment. About half a dozen cases have already been reported in the medical journals in which a needle was suspected to be in the hand or the foot, and, in some instances, had been sought for fruitlessly by a surgeon, in which the use of the X rays demonstrated absolutely, not only its presence, but its exact location, and it has then been an easy matter to extract it. So, too, in an equal number of cases, bullets and shot have been located, even after a prior fruitless search, and have been successfully extracted. Figure 6 is the skiagraph of the hand of a cadaver which shows a needle deeply embedded in the thumb, and also two buck-shot, which were inserted into the palm of the hand through two incisions. It will be noticed that their denser shadow is seen even _through the bones_ of the hand themselves, for the hand was skiagraphed palm downward. Professor von Bergmann of Berlin has uttered, however, a timely warning upon this very point. In many cases, after bullets or shot have been embedded in the tissues for any length of time, they become quite harmless. They are surrounded with a firm capsule of gristly substance which renders them inert. In 1863, soon after I graduated in medicine, I remember very well assisting the late Professor S.D. Gross in extracting a ball from the leg of a soldier who had been wounded at the Borodino, during Napoleon's campaign in Russia. It lay in the leg entirely harmless for almost fifty years, and then became a source of irritation, and was easily found and removed. There are many veterans of the Civil War now living with bullets embedded in their bodies which are doing no harm; and there is not a little danger that in the desire to find and remove them greater harm may be done by an operation than by letting them alone. Glass is, fortunately, quite opaque to the Röntgen rays, and it will be of great service to the patient, if the surgeon shall be able, by skiagraphing the hand, to determine positively whether any fragment of glass still remains in a hand from which it is at least presumed all the fragments have been extracted. Even after the hand has been dressed, it is possible, through the dressing, to skiagraph it, and determine the presence or absence of any such fragments of glass. [Illustration: FIGURE 10.---SKIAGRAPH OF A SECTION OF A HUMAN ARM, SHOWING TUBERCULOUS DISEASE OF THE ELBOW-JOINT. ("American Journal of the Medical Sciences," March, 1896.)]