ANIMAL AND VEGETABLE 



197 



to change the sign from efferent to afferent, but that change 

 could be more rapidly if not more effectively made if a 

 condenser-ganglion cell of the proper capacity were inserted 

 in position. 



Let us assume that we had a downward or efferent 

 current from the brain. along the sympathetic and the 

 argument is not affected if we suppose an upward or 

 afferent current to the brain and it was required to take 

 off at various points an upward current of varying strength. 

 It might easily be done. 



In the following diagram the thick vertical line is 

 intended to represent the chain of the sympathetic 



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Fig. 105. 



Except where a condenser is inserted the impulse from 

 the brain would be efferent, and its current strength would 



