242 PRACTICAL HISTOLOGY [XXXI 



entering nerve-roots and of the outer portion of the 

 column of Burdach, and of numerous fibres throughout 

 the grey substance. On the opposite side of the cord 

 no degeneration is seen. 



Above the segment, the degeneration in a median 

 portion of Goll's column on the side of the injury. 



Below the segment, either no degeneration or a 

 scattered degeneration in the median part of Burdach's 

 column. 



4. Section of foetal cord treated by Golgi's method 

 (cp. 9). Note the wide-spreading processes of the 

 nerve-cells of the grey substance. 



5. Section of cord, to show chromatolysis in 

 anterior horn cells (nerves of cord segment cut about 

 3 weeks, mercuric chloride, methylene blue). Note 

 the excentric position of the nucleus, and the decrease 

 in basophil substance. 



NOTES. 



Spinal Cord. 



The spinal cord and lower part of the brain should be taken 

 out with the dura mater attached, a light weight tied to the 

 cauda equina, a thread passed through the upper part of the 

 dura mater on either side, and the cord suspended by the 

 threads in a tall cylindrical vessel containing the hardening fluid. 



In the cat and dog, if the brain is not required for micro- 

 scopical examination, it is convenient to take out the brain with 

 the cord, and suspend by means of a glass rod passed transversely 

 through the cerebral hemispheres. 



To show the general features of the spinal cord, it is placed 

 in 2 p.c. potassium bichromate for 3 to 4 weeks, washed for a 



