THE CEREBRUM 



237 



(the stripes of Baillarger) have sometimes been counted as addi- 

 tional layers. 



PRACTICAL DEMONSTRATION 



The tissue is to be prepared in the manner usual with nerve -substance 

 hardened with Miiller, followed by alcohol. Thin sections, stained deeply 

 with haematoxylin and eosin, may be mounted in balsam. Sections stained 

 by Golgi's method should be studied if possible. 



SECTION OF HUMAN CEREBRUM CUT PERPENDICULARLY 

 TO THE SURFACE (Fig. 154) 



OBSERVE : 

 (L.) 



The membranes. (In the drawing only the arachnoid and pia 

 are shown.) (a) The fine fibrillar mesh of the arachnoid. 

 (&) The nuclei of the flattened cell-covering, (c) The large 



Fia. 154. VERTICAL, SECTION OF CEREBRAL CORTEX. SUPERIOR FRONTAL 

 CONVOLUTION (X 250). 



A. Arachnoid. 



B. Pia mater. 



1, 2, 3, 4, 5. First, second, third, fourth, and fifth layers of gray matter. 

 6. White matter. 



