THE HISTOGENESIS OF THE CEREBELLUM. 



By C. L. Herrick. 



We are impelled by a recent paper from Dr. Schaper to re- 

 view the utterances of this journal respecting the cerebellum. 

 In the article referred to' several of these publications are re- 

 ferred to but are dismissed with the remark, which is made to 

 apply to all previous work, " Ihre Resultate jedoch erheben 

 sich kaum iiber Vermuthungen." Welcoming as we do the 

 circumstantial confimation of our own investigation we can but 

 feel that the positive results we had published and which rested 

 on long and often-verified study merit a recognition they have 

 not received from Schaper or other subsequent writers. Re- 

 viewing Schaper's work we find nothing new respecting the mor- 

 phology of the organ until we reach the statement that the 

 origin of its substance is not a thickening of the dorsal wall but 

 the migration of elements from two lateral analags. But His 

 has already shown that the cerebellum arises from the Fliigel" 

 platten or lateral aspects, and the writer in 1891 gave a detailed 

 account of the process in the rodents and has repeatedly veri- 

 fied the process in other mammals and lower groups. Plate 

 I of Vol. I of this journal illustrates the morphological rela- 

 tions so fully that it has never seemed necessary to amplify the 

 description. Pages 11-13 of this same volume give a descrip- 

 tion of the way in which the dorson of the cerebellum (which 

 is originally devoid of cells) receives contributions from the 

 everted walls of the lateral recesses and the caudal margin. 

 Of course it is not understood that such folds are mechanically 

 produced but that the sequences of proliferation follow so 

 as to accomplish a result which can only be thus imaged. Em- 



'A. Schaper. Die Morphologische und histologische Entwicklung des 

 Kleinhirns der Teleostier. 1894. 



