Meyer, Data of Modem Neurology. 275 



the nodes of the net, are more or less plainly arranged in rows. 

 They run parallel with the surface of the nucleus and form cir- 

 cles around it, at least along its base and sides but not towards 

 its apex-process. These rows of bodies turn towards the apex 

 where the meshy structure of the perinuclear part of the cell 

 disappears and gives way to a purely striped arrangement of 

 the stainable particles. On the pole of the nucleus situated 

 towards the apex there are frequently rather large stainable 

 masses like nuclear caps. These shields or crescents or irreg- 

 ularly shaped masses of stainable substance are peculiarities of 

 this cell-type. Little is to be said of the structure of the pro- 

 cesses since they consist largely of non-stainable substance. 

 The basal process can be followed a short distance only ; the 

 apex process however for a great length. Although devoid of 

 plain marks it appears striped evidently on account of the pe- 

 culiar structural make-up. It is exceedingly difficult to fix the 

 nuclei of the Purkinje cells ; they are strongly inclined to 

 chromophily. It is not difficult to see how different they are 

 from the nuclei of motor cells.' 



So little is known of the cells of the olives, pons, red nu- 

 cleus etc., that we dispense with their description. They hardly 

 figure as neurones yet except in diagrams. The midbrain me- 

 chanisms, thalami and corpora striata are not much less prob- 

 lematic, although much light has been thrown on them by v. 

 Monakow. The data of knowledge of these parts cannot be 

 incorporated yet in simple diagrams of neurones known in their 

 totality with the exception perhaps of the ganglion habenulae 

 and its ' Anteile ', and the fornix-apparatus. 



For a complete summary of the safe data of the anatomy 

 of the nervous system, we should add an analysis of all the less 

 known types of cell-bodies in the various accumulations of gray 

 matter, and further a summary oi the unfinished analysis of 

 ' white matter.' The progress from the old carmine stain to the 

 Weigert myelin-stain and to the Marchi stain has led to an in- 

 crease of facilities for the study of fibers and their states of 

 myelinization and degeneration. Indeed the study of this point 

 has become so easy that it is almost child's play and it is sur- 



