Hatai, Spinal Ganglion Cells. 



Al 



undergo decomposition and synthesis. Of the substances re- 

 sulting from these transformations some (b) are at once ex- 

 creted as useless, others (c) remain in the protoplasm and are 

 there employed further, while a third class (d) is passed on to 

 the nucleus. The nucleus, moreover, obtains a portion of the 

 substances (e) received from the outside and passed on un- 

 changed through the protoplasm. The substances (d+e) enter- 

 ing into the nucleus there undergo on their part certain trans- 

 formations, from which again substances result ; these in 

 part (f) are given off to the outside without being changed by 

 the protoplasm, in part (h) pass to the protoplasm to find there 

 further employment, and in part (g) remain in the nucleus 

 itself. If, now, we realize that every arrow represents a sum 

 of substances, that the substances passing from the nucleus to 

 the protoplasm undergo transformations as well as those enter- 

 ing from the outside, and that the substances arising from these 

 transformations are in part conveyed again to the nucleus, we 

 obtain an approximate idea of how close the metabolic connec- 

 tion of the nucleus with the protoplasm is." 



Text-figure /. Scheme of cell-metabolism (Verworn) 



All these changes illustrated by Verworn may be traced 

 also within the nerve cells. It is, however, always difficult to 

 correlate physiological phenomena with histological structure, 

 but from the present studies on the nerve cells, sufficient evi- 

 dence has been obtained to make some application of the his- 

 tological facts to the physiological phenomena in the nerve cells. 



