204 HANSFORD MacCURDY 



EXPLANATION OF FIGURES 



All figures were drawn with the aid of the camera lucida and are magnified 375 

 diameters. Figures 1 and 2 are from preparations made by the Nissl method; the 

 others are from preparations made by the vom Rath method; all are from the fifth 

 abdominal ganglion of Cambarus bartonii. 



1. Large ganglion cell, normal; Nissl method. 



2. Large ganglion cell from ganglion isolated twelve days; nucleus collapsing, 

 axis-cylinder area reduced, fibrillse indistinct. 



3. Large ganglion cell showing normal condition of axis cylinder, fibrilla?, nu- 

 cleus, and "flakes;" vom Rath method. 



4. Large ganglion cell from ganglion isolated twelve days; tortuous and nodular 

 fibrillse. Compare with figs. 2 and 3. 



5. Ganglion cell from ganglion isolated fifteen days; nucleus and axis cylinder 

 reduced, fibrillse breaking up, cytoplasm granular. 



6. Ganglion cell from ganglion isolated twenty-six days; nucleus collapsed, 

 fibrillae absent, cytoplasm granular. 



7. Ganglion cell from ganglia isolated twenty-eight days ; nucleus and nucleolus 

 disappearing, cytoplasm granular. 



8. Ganglion cell from ganglion isolated thirty days; nucleus and nucleolus dis- 

 integrating (seen in only a few cells), cytoplasm faintly granular. 



9. Ganglion cell from ganglion isolated twenty-nine days; nucleolus has dis- 

 appeared; cell-contents faintly granular and apparently very fluid. 



