138 



naked axones. The nuclei that remain are about the same size and 

 show a similar details of structure, such as chromatin granules, etc. 



We conclude from this study that the great decrease in size in 

 the cross section of the spinal cord (taken at similar levels) is largely 

 due to the changes occurring in the grey substance. We are not ready 

 to make any statement at this time as to the exact nature of these 

 changes. 



Dorsal Ganglia. In attempting to dissect the dorsal ganglia, 

 the first condition to be noticed was the entire absence in the 16 months 

 starved animal of the reddish masses of fat between the vertebrae 

 which are so characteristic in Necturus. Photographs 3 and 4 indicate 



Fig. 3. ^ Fig. 4. 



Fig. 3 and Fig. 4. Photographs of two dorsal ganglia dissected out from the less 

 starved and the more starved specimens. Note the great reduction in size in the more 

 starved specimen. The photographs are taken at the same magnification. 



the conditions. In the 4 months starved Necturus there is so much 

 fat that no idea of the shape of the ganglia or the relation of the 

 nerve roots can be obtained. When the fat is removed the usual re- 

 lations of the dorsal ganglia are indicated but in the 16 months starved 

 animal there is a more or less loosely organized mass {x photo 4), in 

 which are found the nerve cells. The fat globules have all been ab- 

 sorbed leaving a skeleton-like conditions behind as indicating their 

 former presence. In the 4 months starved in removing the fat, it was 

 found that the nerve cells were dissected free which shows that this 

 fat is intimately associated with the dorsal ganglia. 



The living nerve cells from both animals were dissected and 



