276 S. WALTER RANSON 



PLATE 2 



EXPLANATION OF FIGURES 



2 From the seventh cervical segment. A narrow strip at right angles to the 

 apex of the posterior cornu: a, fasciculus cuneatus; b, Lissauer's tract; c, the dor 

 sal spino-cerebellar tract. The medium sized and large lightly stained axons are 

 medullated, the fine darkly stained ones non-medullated. The latter are very 

 numerous and closely packed together in the tract of Lissauer. X 648. 



3 Diagrammatic representation of the eighth thoracic segment, showing the 

 shape and position of Lissauer's tract. X 17. 



4 Diagrammatic representation of the fifth lumbar segment, showing the shape 

 and position of Lissauer's tract. X 17. 



5 Diagrammatic representation of the first sacral segment, showing the shape 

 and position of Lissauer's tract, n, Lissauer's tract, 6 and c, connective tissue 

 septa dividing the entering root bundle into smaller fascicles. Bundles of non- 

 medullated fibers are grouped along these septa. Other bundles of non-medul- 

 lated fibers are seen at d and d' . X 17. 



