Hatai, Ganglion Cells in the Rat. 123 



grams are as follows: Cervical 1:5.5; thoracic i:ii; lumbar 

 1:11.5 ; while in the mature form the ratios are 1:2.7 ; i'4-3 > 

 1:5.7 respectively — Table VII. 



9. The ratios between the fibers and large cells at matur- 

 ity are as follows: Cervical i:i.i; thoracic 1:1.2; lumbar 

 12:2.— Table VII. 



10. Excessive number of cells in the thoracic and lumbar 

 ganglia is possibly to be explained in part by the presence of 

 large numbers ot Dogiel's cells of second type in these local- 

 ities. The explanation is, however, not a complete one- — 

 Table VII. 



11. The mean diameters of the cell-bodies, nuclei and 

 fibers give the highest figures at the cervical region ; the lum- 

 bar comes next in rank and the thoracic last. The growth of 

 the cytoplasm is always more rapid than that of the nucleus. 



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