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Fig 2 From the same section as figure 1, showing the meduUated fibers in the 

 partly degenerated tract of Lissauer. The left side of the drawing is from the 

 lateral half of the tract and shows the normal number of meduUated fibers, the 

 right side is from the medial half of the tract and shows a marked decrease m the 

 number of meduUated fibers. Pal-W eigert. X 400. , , •„ , 



Fig 3 From the seventh lumbar segment of the spinal cord of a cat ki led 

 20 days after the unilateral division of the sixth and seventh lumbar roots. N o ice 

 the degeneration in the cuneate fasciculus and in the medial half of the tract ot 

 Lissauer. Marchi. X 40. L.L, Lissauer's tract; r.p., radix posterior. 



538 



