The proper relation which the X-ray should hold in medico-legal medicine has not yet been determined. When the announcement was made of the discovery of the Röntgen ray, it was given a wider scope of usefulness than clinical experience has yet been able to demonstrate. It is not my object to find fault with the skiagraph or cast any reflections upon the benefits which humanity has or may derive from its use, yet I feel from the experience of myself and others that it has not reached a degree of certainty that warrants us to depend upon it as a safe and positive method of diagnosis. In ordinary photography, in which a photograph is taken of the real object itself, the position, the light, the focus and many other auxiliaries may greatly modify the photograph taken of the same person on the same day with the same apparatus, in the