CORRELATION BETWEEN METABOLIC GRADIENTS. 



329 



common hydrozoan hydroids have been studied by Child (' 

 '216) by means of various toxic solutions, dyes, and potassium 

 permanganate, and have been confirmed by Hyman on the same 



TABLE I. 



ELECTRIC GRADIENT OF Leucosolenia AND Grantia. NEGATIVE AND POSITIVE AS 



IN THE GALVANOMETER. 



and other species. The gradients are the same in all of the species 

 studied. The hydranths are more susceptible and have greater 

 reducing power than the stems. The gradient in each hydranth 



