164 
A  Piece  of  Pitchblende. 
(  Am.  Jour.  Pharru. 
\       April,  1909. 
great  English  chemist.  Prof.  William  Ramsay,  in  searching  for  com- 
pounds of  the  then  newly  discovered  element  argon,  had  his  attention 
called  to  the  cleveite  gas,  and  made  a  thorough  chemical  and  spec- 
Copyright,  1904,  Scientific  American. 
Sir  William  Ramsay  in  his  laboratory 
troscopic  examination  of  it.  To  his  surprise  it  showed  a  spectrum 
entirely  different  from  that  of  either  argon  or  any  other  known 
terrestrial  element.    The  most  characteristic  of  the  several  bright 
