2 74 Journal of Comparative Neurology. 



ingly similar to the ' motor cells ' of the ventral horns, except 

 in shape and general arrangement. The cell-body is twice to 

 three times as long as broad and the heavy terminal dendrites 

 with the typical spindles take a longitudinal course. The lateral 

 dendrites are not very numerous, but turn at once into a longi- 

 tudinal course, frequently so that one branch grows caudad and 

 the other cephalad. The neurite originates from the side of the 

 cell-body. This observation explains many peculiarities of the 

 cells shown on transverse sections. The difficulty of differen- 

 tiating them from the ' motor type ' may become of import- 

 ance in the final criticism of the question : to what extent are 

 the form and structure of a cell characteristic for its functional 

 connections ? We shall show in a future article to what extent 

 the size of the cell and the architecture of the tissue generally 

 are of importance for the arrangement of the Nissl-bodies. The 

 connection between these cells and the fibers of the direct cere- 

 bellar tract are little known, perhaps on account of their 

 oblique course ; the upper course of the fibers is in the center 

 of the restiform body and the termination in the cortex of the 

 upper worm of the same and of the opposite side. 



The cerebellar afferent neurones of the brachial region 

 partly constitute the nuclei of Stilling (the homologue of 

 Clarke's column in the cervical segments), partly unite into the 

 external nucleus of Burdach ; those of the cranial segments are 

 much less localized (lateral nucleus, olives and red nuclei ?), 



The efferent cerebellar neurones are undoubtedly the Pur- 

 kinje cells and the cells of the central nuclei of the cere- 

 bellum. While the course of their axones is a matter of 

 varying opinion, the structure of the Purkinje cells is so well 

 known that we outline it here for the purpose of establishing 

 another type of neurones. 



The remarkably graceful silhouettes obtained with the Gol- 

 gi method are familiar. Nissl gives the following description of 

 this type of structure (Z. f. Psychiatric, Vol. 54, p. 69): ' A 

 careful study of a Purkinje cell not only reveals a net-shaped 

 type of a structure but moreover stripes. The stainable 

 bodies, embedded in the net-work so as to form, as it were, 



