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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.
The dense shadows cast by bone are, at least at present, an insuperable obstacle to skiagraphing the soft translucent organs of the body which are enclosed within a more or less complete bony case, as the rays will be intercepted by the bones.
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