Meyer, Data of Modem Neurology. 273 



further the cell-tj'pes of the cornu ammonis etc. The cell- 

 bodies are very eagerly studied now both by the Nissl school 

 and the friends of the Golgi method. It is by no means an 

 easy task to correlate the two series of results, because the 

 gemmules, very striking parts of the Golgi pictures, are but 

 rarely reproduced by other stains. 



3. The study of the cerebellar mechanisms has re- 

 ceived a new stimulus through the application of the methods 

 of Golgi and of Marchi. The field is, however, still full of 

 contradictions. For the plan of the brain I should accept the 

 sketch of Thomas,^ since my own investigations on this point 

 are not yet sufficiently advanced. Only few of the elements 

 which unquestionably belong to the cerebellar apparatus are 

 known so as to be pictured as neurones on ground of actual 

 demonstration. We take up only the best known elements. 



Since Flechsig's investigations, the direct cerebellar tract 

 is known as the principal afferent system of the cerebellum 

 from the spinal segments. The cells of Clark's column are 

 considered to give origin to it. They have a fairly characteris- 

 tic structure. The stainable substance is arranged in fairly 

 uniform medium-sized granules, fiUing the cytoplasm, perhaps 

 more uniform and larger than those of the afferent cerebral 

 cells. The nucleus is large, frequently covered up somewhat, 

 and more or less near the center of the cell ; in other cells it 

 stands in an area where the granules have disappeared and just 

 form a peripheral ring around the cell ; and again I have found 

 it excentrically located, even bulging beyond the natural pe- 

 riphery of the cell, just as in the cells in which the neurite was 

 cut ; a condition which was found by Marinesco in locomotor 

 ataxia, by Councilman and Barker in meningitis and by myself 

 moreover in elderly people without any observed cerebellar or 

 other affection. The dendrites are slender ; the stainable sub- 

 stance in them is scanty and in granules rather than in short 

 streaks. The description given here is that of transverse sec- 

 tions. In the oblique and longitudinal ones, the cells are strik- 



^ Le Cervelet, Etude anatomique, clinique et physiologique. Paris, 1897. 



