m 



syst 



TISSUES IN GENERAL, 



129 





in the protoplasma of all structure-elements of the nervous 

 system it is distributed in thin layers as granules and lumps, 

 and is of an opaque gray color. All granules and lumps of the 

 living matter are interconnected by delicate radiating spokes. 

 (See Figs. 42 and 43.) 



In the ganglion-corpuscles, especially in their nuclei, the 

 spokes have been observed by a large number of investigators,* 

 who interpreted these spokes as belonging exclusively to gan- 

 glion-corpuscles, or as prod- 

 ucts of coagulation. I am 

 unable to see in these forma- 

 tions a structure different 

 from that of cartilage-corpus- 

 cles or that of living proto- 



FIG. 43. SPECIMEN FROM THE COR- 

 PORA QUADRIGEMINA OF A RECENTLY 



KILLED GROWN RABBIT ; KEPT IN 

 A DILUTE SOLUTION OF BICHRO- 

 MATE OF POTASH. [PUBLISHED IN 

 1873.] 





FIG. 42. SECTION FROM THE COR- 

 TEX OF THE BRAIN OF A RECENTLY 

 KILLED GROWN RABBIT ; KEPT IN 

 A ONE-HALF PER CENT. SOLUTION 

 OF CHLORIDE OF SODIUM. [PUB- 

 LISHED IN. 1873.] 



In the grayish reticulum of living matter 

 there are nuclei, N; ganglion-corpuscles, G; 

 with axis-cylinder offshoots, A. Some axis- 

 cylinders with varicosities, V. Magnified 800 



plasm in general ; true, in the (Uameters - 

 ganglion-corpuscles the struct- 

 ure is very prominent. Such spokes are in some cases also dis- 

 tinctly seen to project from the periphery of the ganglionic cor- 



JP, the grayish reticulum of living matter, 

 with numerous nuclei, 2f. Magnified 800 

 diameters. 



* The literature is found in Jul. Arnold, " Ein Beitrag zu der feineren 

 Structur der Ganglienzellen." Virchow's Archiv, 41 Bd. 1867. 

 9 



