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GEORGE FRED SUTHERLAND. 



the blood plasma any free elements such as the injured and de- 

 generating nuclei with very little cytoplasm and hence little 

 connection with other cells; and when this fluid breaks through, 

 some of these nuclei may break off and float away. At one hour 

 after the operation, broken and small rounded nuclei are seen in 



MtC 



Fig. 7. Sagittal section through the spinal cord and the surrounding region one 

 hour after the operation, showing irregularly shaped, deeply-staining nuclei in 

 the end of the spinal cord and in the coagulated plasma layer, dn, deeply-staining 

 nuclei; pi, plasma layer; ct, connective tissue; 7itc, notocord. (1,100 diameters.) 



the end of the spinal cord and extending out into the hardened 

 layer of the plasma, giving evidence of some force acting outward 

 at this time (Fig. 7). Other evidences will be mentioned in 

 describing the stages at which they appear. 



