136 Bayliss and Bradford, The electrical phenomena accompanying secretion. 



Reviewing then the above facts it seems probable that the watery 

 secretion produced by the excitation of a nerve in which the „secretory" 

 fibres of Heidenhain predominate , is accompanied by a variation, in- 

 dicating the hilus of the gland to become positive to the surface; and 

 that the viscid secretion produced by the excitation of a nerve, in which 

 the so called „trophic" fibres predominate, is accompanied by a variation 

 of opposite sign. 



