. Röntgen ray diagnosis and therapy . such calculi can be represented best which consistof hard and firm material, like oxalates, while the more penetrablephosphates cast an indistinct shadow,and the translucent urates hardly at we learn that the success of ski-agraphy in calculi of the urinary tractdepends largely on the chemical compo-sition of the calculi, and, consequently,on their greater or lesser opacity. Still,with the aid of the diaphragm more orless marked shadows even of the uratesare obtained. The beautiful work ofAbbe, Bevan, and Leonard, all of thiscountry, furnish strik
. Röntgen ray diagnosis and therapy . such calculi can be represented best which consistof hard and firm material, like oxalates, while the more penetrablephosphates cast an indistinct shadow,and the translucent urates hardly at we learn that the success of ski-agraphy in calculi of the urinary tractdepends largely on the chemical compo-sition of the calculi, and, consequently,on their greater or lesser opacity. Still,with the aid of the diaphragm more orless marked shadows even of the uratesare obtained. The beautiful work ofAbbe, Bevan, and Leonard, all of thiscountry, furnish striking illustrationsof the immense progress of this youngscience in the short space of a few years. As to the technique of the skiagra-phy of renal concretions many of theprinciples emphasized in connectionwith biliary calculi hold good (see p. 113). Considering the diffusion of the rays, the use of a dia-phragm is indispensable. Thus even small calculi may be repre-sented. In regard to their chemical composition, it should also be re-. Fig. 78.—Biliary Calculus. 124 THE RONTGEN EAYS membered that a calculus may consist of different salts. In oneof the authors cases five layers were found, the nucleus and thirdlayer consisting of calcium carbonate, its branches of a combina-
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