soMr cnxTr\rrnn 1RV .tnr.ixrrs- rx rnv'^rc'^ vi i-»7 



Kig. 10 — S|)octriim lines siiUlivided and spread out in the Crookes dark space by 

 the strong and variable field. See lootnote ". (J. S. Foster, Physical Review) 



Fig. 11 — A group of lines near X43S8 Cparlielium s|x?ctruni) resolved and spread 

 out in the Crookes dark space. See footnote ". 



