lissauer's tract 



533 



of collapse and die of shock in from ten to thirty minutes. It was 

 found that one five-hundredth of a grain of atropin given hypo- 

 dermatically a few minutes before the roots were cut, while not 

 entirely eliminating shock, prevented its fatal termination. 



TABLE 1 



List of experiments 



At the autopsy the roots were identified and it was determined 

 positively which roots had been injured. Each of the lumbar 

 and the first two of the sacral segments of the cord were identified 

 and the cord was then divided into these nine segments which 

 were kept separate for histological study. These segments 

 were so large that they required further subdivision to secure the 

 penetration of the fixing fluids. So far as possible, serial sections 

 were made of these subdivisions of the segments. Since the 

 material from Cat III was to be fixed in Muller's fluid, the seg- 

 ments did not require subdivision, and the entire sixth lumbar 

 segment was cut into serial sections. In Cats IV and VI the 

 segments were spht longitudinally into ventral and dorsal halves, 

 of which only the dorsal halves were preserved and prepared by 

 the pyridine-silver method without further sub-division. This 

 rendered possible the cutting of serial sections of the entire dor- 

 sal halves of the segments immediately involved in the operation. 

 The Pal-Weigert and IVIarchi methods are well known and re- 

 quire no explanation. The technique of the pyridine-silver 

 method has been given elsewhere (Ranson '12). 



