328 ELEMENTARY PHYSIOLOGY. [XXX. 



(between the fibres a considerable number 

 of leucocytes will be seen) ; from this bundles 

 of fibres at fairly regular intervals run out 

 into the grey substance, usually ceasing to 

 be distinct in the third layer (cp. d). 



b. At the outer limit of this a layer of fusiform 

 nerve cells lying amongst nerve fibres and 

 forming the 5th layer of the grey substance 

 of the cortex. 



c. Outside this, a layer of small cells of various 

 shapes, cells with three or more obvious 

 though small processes predominating (angu- 

 lar cells); these form the 4th layer of the 

 cortex. 



d. Outside (c) are large pyramidal cells, the 

 process from the apex of the cell tapering off 

 from it and often being traceable upwards 

 for a considerable distance ; from the base 

 three, four or more processes may be seen to 

 proceed. The district of the large pyramidal 

 cells forms the 3rd layer of the cortex ; it 

 will be seen that it is much thicker than any 

 of the rest, and that generally speaking its 

 cells diminish in size from within outwards. 

 Small angular cells may be seen in its deepest 

 part. 



e. Outside the preceding layer is a thin layer 

 with numerous small pyramidal cells, the 

 peripheral process being usually distinct; 

 this is the 2nd layer. 



