184 



PHYSIOLOGY 



CHAP. 



This point of view was adopted by Erik Miiller, Boll, Schwalbe, 

 and Kanvier, and was subsequently carried further by Hemming 

 (1895), who on staining with hsematoxylin described independent 

 fibrils 'in the dendrites which were continued into the cell body, 

 though he could not trace them distinctly into the centre of the 

 cell, where they seemed to anastomose to form a network. 



The theory of the fibrillary nature of the protoplasm of the 

 nerve-cells was disputed by v. Lenhossek, but it was adopted and 

 defended by Dogiel, Donaggio, Becker, Marinesco, Held, and 

 Lugaro. In 1896, Donaggio, with a special method of elective 



FIG. 120. Peripheral network of nerve-cells from dog's spinal cord. (Donaggio.) 



staining, observed and described a fibrillary network that per- 

 vades both the interior and the periphery of the nerve-cells, and 

 in which the fibrils from the surrounding tissue terminate 

 (Fig. 120). 



Lugaro (1897) convinced himself, with the same haematoxylin 

 method as Flemming employed, of the fibrillary structure of the 

 spinal ganglion cells of dogs poisoned with arsenic, which totally 

 destroyed the chromatic substance at the periphery of the cell 

 body. The fibrils, according to Lugaro, anastomose among them- 

 selves, forming a very delicate reticulum in certain types of cells, 

 a coarser network in others. He made analogous observations 

 upon the cells of the nerve-centres of animals subjected to ex- 

 perimental hyperthermia. 



