772 



It is certain, meanwhile, thai neither the summer shifts nor the 

 fluorescein shifts depend on the radio-active elements, as these are 

 the same in summer and in winter. We are inclined to think the 

 different reaction of the muscle cells to be the cause. But before 

 ascribing the different behaviour to the more or less mysterious 

 nature of the automatic rhythm it will be good to study the factors 

 to which the adsorption of the heavy and the light metals is due. 

 Much ^) in the phenomena observed may perhaps be accounted for 

 by the mutual adsorption-extrusions of the ions. The antagonism, 

 which manifests itself after the adsorptions have brought the ions 

 in tJje vicinity of the irritable substance, does not offer any ground 

 for explanation. 



^) For instance: standstill inside one iiiinute, when a suitable uranium fluid is 

 rapidly replaced by a potassium fluid, of itself also suitable ; the approximately hori- 

 zontal character of the equilibrium curve with the higher doses; the calcium effect. 



