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X-ray arteriogram of the hand (1904). An early X- ray showing in fine detail the arteries of the human hand. The X-ray was made by Alfred G. Fryatt of Melbourne, Australia, published in the Archives of the Roentgen Ray (1904). The arm of a cadaver was used, injected at the shoulder with what is assumed to have been mercury. The radial (lower left) and ulnar (lower right) arteries branch to supply the fingers with blood. This important diagnostic technique was later to become known as an arteriogram or angiogram. It took, however, many years before harmless X-ray opaque substances were developed which could be injected to show arteries in living patients. (KEYSTONE/SCIENCE PHOTO LIBRARY/SCIENCE PHOTO LIBRARY)