160 PROGKESS IN EADIOGRAPHT. 



Marie and Ribaut have given much study to a method of investiga- 

 tion and X ray analysis based upon stereoscopy. Tliese experiments 

 are by no means lacking in interest, their radioscope-stereoscope 

 being particularh^ meritorious, though experience has demonstrated, 

 especially in the case of extracting projectiles, that human vision, 

 however perfect it may be, is a i:)Oor substitute for a mechanical 

 guide to the location of the foreign bod3^ 



Doctor Bouchacourt is the author of a method of investigation 

 with the X rays which he calls endodiascopic {svSov^ from within; 

 Sia^ through; gkottsiv^ to examine). He employs specially con- 

 structed Crookes tubes, which are introduced into the body through 

 the natural apertures. The tube projects a silhouette on a screen 

 (endodiascopy-radioscopy) or on a plate (endodiascopy-radiography) 

 of the parts of the organism coming between it and the screen or 

 the plate. 



Marie and Cluzot, James Makenzie, Davidson and Hedley, Mergies, 

 Leduc, Massiot, Maunory, and others are also engaged in endeavors 

 to work out problems in various directions of research. 



The science of the application of the properties of the X rays to 

 the analysis of the human body is an admirable and valuable devel- 

 opment, but one around which, unfortunately, harmful misapplica- 

 tions have clustered since its beginning. 



In conclusion, the utilization of the X rays in medicine and sur- 

 gery since its inception with Roentgen's discovery has developed 

 into a science essentially exact, precise, and certain — a science with 

 which you especially must sympathize because in its highest form 

 radiography has borrowed so much from photography. Moreover, 

 it is a science to interest us all, because it is constantly being called 

 upon to play a more or less important role in the relief of those ills 

 the flesh is heir to. 



But learn how to discriminate between the good and the bad meth- 

 ods of applying the X rays; discover how to select the rational and 

 valuable processes of analysis ; begin this by noting that simple radi- 

 ography and metroradiography are capable of meeting every ex- 

 igency. 



The skeleton is perhaps the part of the human organism that may 

 best be studied with radiography and metroradiography. The radio- 

 graph pictures the bones of the infant as soon as they begin to form, 

 before birth even. Although these observations during gestation 

 may not be of any general interest, it is of great value to the parents 

 to know that their child has a well-formed skeleton. While the bones 

 of the infant are still soft a close watch on their development may 

 permit the prevention or reduction of malformations which might 

 be difficult to correct later. Parents anxious about their children's 



