Raks. —Nerve-Cell Centroaome. 



PLATE 1. 



All the figures magnified 2000 diameters. 



Figs. 1-3. Cells from the suboesophageal ganglion of a normal worm. Iron- 



heemato.xylin. 

 Fig. 4. Cell from the brain of the same worm. 



Figs. 5, 6. Cells from a posterior ganglion of a normal worm. Acetic-sublimate, 



iron-haematoxylin. 



