140 Miss M. P. FitzGerald. The Lumbosacral-coccygeal [June 1' 



Chart JK. 



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1-8 



I I II IF V "VI "VI I I I F I III 



Lumbar Sacral Coccygeal 



Chart XX.— Curves showing the Eate of Increase or Decrease of the Section Areas of 

 the Cord, the Grey and the "White Substances, and their Component Parts 

 (Table XXI). 



The mean sectional area of the first lumbar region is in each ca.se taken as unity. The 

 abscissae denote spinal nerve regions, the ordinates rate of increase or decrease. 

 Group S. — Cross-section of cord Heavy black line. 



Total grey substance Eed line. 



Total white substance Thin black line. 



Group Z. — Total white substance Black continuous line. 



Dorsal white columns Black interrupted line. 



Ventro-lateral white columns ... Black line and dot. 

 Group B. — Total grey substance Bed continuous line. 



Dorsal horns Bed interrupted line. 



Ventral horns Bed line and dot. 



