Manchester Memoirs, Vol. xlviii. (1904), No. 8. 1/ 



Table of the known Disintegration Series. 



URANIUM. 



THORIUM. 



RADIUM. 



,X\ 



/\ 



/^ 



/ \ 



/ \ 



/ \ 



Uranium X a particles 



Thorium X a particles 



Emanation a particles 

 of Radium 



\ >^ 



\ ^ 



l^^\ 



? /3 particles 



Emanation a particles 



i ^-^- 





of Thorium (perhaps 



Matter 'V a particles 





1"--^^^ /3 also) 



causing 







\ ^ 



the induced 







Matter 



a particles 



activity of 

 Radium. 







causing the 

 excited 





First Stage ^ 





activity of 







^-v^,^ 





Thorium. 







^^"•v^ 





First Stage 





Ditto. 1 a particles 



- 



1 





Second V 





\ 





Stage 





Ditto. 









Second Stage 





Ditto. ) 





1^. 







\ ^\ 



r 



Third 





1 a and /3 



Stage 





particles 





^^^^^^^ 







> 



^ 







(1) a and /3 







Polonium particles 







1 ^^^ 







1 a particles 



