SEARCH FOK AN INACTIVE ISOTOPE OF THE ELEMENT t<4 (POLOMI .M) 141 



om. of the clement in question. 'I'his negative lesuH is in agreement 

 with generalisations arrived at by Dr. A. S. Russell. 



There is very little hope of finding an inactive polonium isotope, 

 or in general of extending beyond bismuth (83) the series of stal)le 

 elements. 



