

CONTRIBUTIONS TO THE COMPARATIVE 



MORPHOLOGY OF THE CENTRAL 



NERVOUvS SYSTEM. 



I.— ILLUSTRATIONS OF THE ARCHETECTONIC OF THE 

 CEREBELLUM.— Plates I-IV. 



C. L. Herrick. 



Aside from the physiological questions offered by the 

 epencephalon, which are confessedly among the most diffi- 

 cult of neurology, there are many more general problems re- 

 specting the principle and details of construction, relation to 

 other parts of the central organ, and histogenesis, which are 

 very far from a satisfactory solution. Even those points 

 which can be accepted as well settled require conci'ete 

 illustration to make them available for purposes of instruc- 

 tion. In the following notes it will not be necessary to 

 sharply define that part which is regarded as a new con- 

 tribution to our knowledge from the points for which the 

 more general utility is hoped, since all the statements are 

 equally the result of direct observation and are quite inde- 

 pendent of the work of others. 



It is hoped that the comparison of the several groups of 

 vertebrates and identification of the close correspondence 

 between the respective adult conditions of the organ and the 

 transitory stages in the mammalian cerebellum during its 

 development may add force to the plea for more complete 

 application of this comparative method to the study of neu- 

 rological problems. 



