PLATE II.-PERIPHERAL ORGANS AND COMPOUND NERVE 

 TRUNKS. 



rig. i. 



Diagram of three papillse from the frog's tongue, to show the arrangement of the 



nerve fibres. Each papilla is connected -with its neighbours by fibres, as -well as 



with the nervous centre. Amongst these are, 1, afferent fibres ; 2, efferent fibres ; 



3, commiss-ual peripheral fibres ; and 4, commissual central fibres. 



Fig. 2. 



centre. 



Central and peripheral portion of spinal nervous system, showing sub-division of 



dark-bordered fibre into a large number of fibres as it approaches both centre 



and periphery. See also PI. Ill, fig. 1. p. 187. 



Pig. 3. 



Fig. 4. 



The course and division of individual 

 dark-bordered nerve fibres showing 

 that one of the fibres resulting from 

 the sub-division of a fibre passes on 

 in the direction of the original fibre, 

 while the other passes into the branch 

 which diverges from the trunk. 



A nerve dividing into three branches. 

 From the breast muscle of the frog. 

 At a and b individual dark-bordered 

 fibres are seen to divide, the fibres 

 resulting from the sub-division pass- 

 ing onwards in different branches. 

 Copied from an actual specimen. 



