581 



components. Finally a larger amount of uranium restores the heart's 

 beat. 



Considering that besides radio-active, also non-radio-active para- 

 doxes occur, (NoYONS, Blsqdet) no conclusive value can be ascei'tained 

 in the easiU' generated, transient standstills when passing fi'om a 

 uranium liquid to a caesium liquid and vice versa. It is different 

 with the equilibria, which can only be interpreted radio-plijsiolo- 

 gicall3'. This is most e\ident with the higher equilibria in which 

 each of the components, co-exist in the mixture in quantities that 

 undoubtedly surpass the threshold-concentration. 



Our inquirj-, then, is to the following effect : 



1'. the impurity that imjiaits to the commercial prepaiation of 

 caesium a feeble radiating power, is presumably a heavy radio- 

 active element. 



2°. the biological action of the impurity has the nature of a beta- 

 radiator. 



