THE CYTOPLASM 



47 



am acquainted has been described by Bolsius and Graf in the neph- 

 ridial cells of leeches as shown in Fig. 19 (from a preparation by 

 Dr. Arnold Graf). The mesh work is here of great distinctness and 

 regularity, and scattered microsomes are found along its threads. It 





v x^?r^ 



K ^f^M 



VH\ , -..v- x. ,.- / 



. yj^ \v* %* ! 



Fig. 20. Spinal ganglion-cell of the frog. [LENHOSSEK.] 



The nucleus contains a single intensely chromatic nucleolus, and a paler linin-network with 

 rounded chromatin-granules. The cytoplasmic fibrillae are faintly shown passing out into the 

 nerve-process below. (They are figured as far more distinct by Flemming.) The dark cyto- 

 plasmic masses are the deeply staining " chromophilic granules" (Nissl) of unknown function. 

 (The centrosome, which lies near the centre of the cell, is shown in Fig. 8, C.) At the left, two 

 connective tissue-cells. 



appears with equal clearness, though in a somewhat different form, 

 in many eggs, where the meshes are rounded and often contain food- 

 matters or deutoplasm in the inter-spaces (Figs. 59, 60). In cartilage- 

 cells and connective tissue-cells, where the threads can be plainly seen 



