PRINCIPLES OF GENERAL PHYSIOLOGY 



innervation of the eye muscles, as given by Descartes, approaches the ' ' drainage " views of 

 Macdougall and von Uexkiill, if we read "neurin," "nerve^energy," "lomis" or "excitation" 



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in place of " Esprits Animaux." The essential difference between the present view of recipro- 

 cal innervation and that of Descartes is that the latter placed the mechanism in peripheral 

 structures, whereas we know now, by experiment, that it is in the nerve centres. 



