Description of figures of the Plates XYI, XYII. 



Fig. 1. T. S. Mesencephalon of cat at level of root of 3rd. nerve showing fibres 

 passing from degenerated crusta on left side to ant. corp. quad, of same 

 side, a few crossing to that of opposite side, x 10 diam. 



Fig. 2. T. S. Pons Varolii of cat showing fine degeneration scattered around 

 the degenerated pyramidal bundles on the left side (right in fig.j. x 25 

 diam. 



Fig. 3. T. S. Medulla oblongata of cat through lowest part of pyramidal decus- 

 sation, showing homolateral and heterolateral fibres, x 10 diam. 



Fig. 4. T. S. Spinal cord of cat through 6tli cervical segment, showing fibres 

 entering base of posterior horn from right crossed pyramidal tract 

 (left side in fig.) , and fine degeneration in adjacent grey matter, x 10 

 diam. 



Fig. 5. T. S. Spinal cord of cat through mid-dorsal region shows crossed and 

 direct lateral pyramidal tracts, x 10 diam. 



Fig. 6. T. S. Spinal cord of cat through 3^^. lumbar segment. Shows crossed 

 and direct tracts with a few fibres passing into grey matter at base of 

 posterior horn on right side, x 10 diam. 



Fig. 7. T. S. Pons Varolii of dog showing fine degeneration scattered around 

 the degenerated pyramidal bundles in the nuclei pontis. x 10 diam. 



The same section x 100 diam. 



T. S. Through upper part of pons Varolii of monkey, shows fine degene- 

 ration scattered round pyramidal bundles on side of lesion (left), x 6 

 diam. 



Same section x 60 diam. 



T. S. Medulla oblongata through middle of inferior olive of monkey, 

 showing fibres passing from left degenerated pyramid to formatio reti- 

 cularis of opposite and same sides. X 6 diam. 



Fig. 12. T. S. Medulla oblongata of monkey through upper part of pyramidal 

 decussation, x 10 diam. 



Fig. 13. T. S. Medulla oblongata of monkey through lower part of pyramidal de- 

 cussation. Observe homolateral fibres at this level, x 10 diam. 



Fig. 



8. 



Fig. 



9. 



Fig. 



10. 



Fig. 



11, 



