274 Degenerations in the Brain and Spinal Cord, $c. [Mar. lo, 



4. Removal of Cerebellum and Immediate Absinthe Stimulation. Re- 

 moval of one Lobe of the Cerebellum. Removal of Left Hemisphere 

 and Left Lobe of the Cerebellum. Removal of Left Hemisphere and 

 Right Lobe of the Cerebellum and v. v. Immediate and Re, 

 Absinthe Stimulation. 



Result. Removal of the whole cerebellum does not stop the fii 

 nor impart to them any special character. Removal of one lobe 

 the cerebellum appears to have very little effect upon the fits. 

 Where, in addition the opposite cerebral hemisphere is removed, the 

 fits appear similar to those seen when the hemisphere alone is 

 removed. 



5. Removal of Left Hemisphere and Subsequent Section of the Right 



Left Halves of the Cervical Spinal Cord. 



Result. Conduction abolished on the side of section. 



6. Hemisection of the Upper Cervical Spinal Cord and Absinthe Stir, 



lotion. 



Result. In cats which have partially recovered from the effect* 

 the hemisection, absinthe produces a response upon the side whk 

 was divided. 



7. Complete Section in the Dorsal Region. 



Result. In two cases of complete recovery (complete paralysis 

 the hind quarters remaining), absinthe did not elicit a response froi 

 the distal segment of the cord ; the experiments, however, requii 

 repeating. 



PART IV. Conclusions. 



The formation of the descending system of the anterior, an 

 lateral, and lateral columns can be seen in the mesencephalon. 



There is a marked decussation of the lateral and antero-lateral 

 column fibres in the mesencephalon. The anterior column fib: 

 (post. -longitudinal handle) appear to be direct fibres Deca 

 is, however, not limited to this region ; it occurs in the spinal cord, 

 and probably throughout the bulbo-spinal system. 



Decussation of the pyramidal system is not limited to the cerviotl 

 region ; it occurs in the higher segments. As in the preceding 

 system so in this, there is a direct path the direct lateral pyramidal 

 tract, and there is evidence of direct fibres in the higher segments. 



There is bilateral distribntion of both systems of fibres, but there is 

 no evidence whatever of recrossed fibres. 





