6 "N RAYS 



those which graze the cathode. One should 

 expect these to be very incompletely polarized ; 

 and, indeed the small spark enabled me to 

 confirm this. 



I noted several important facts, which, how- 

 ever, I will merely allude to in the present 

 paper. Quartz and lump- sugar rotate the 

 plane of polarization of " X " rays in the same 

 sense as that of light. I obtained rotations 

 of 40. 



Secondary rays, styled " S " rays, are also 

 polarized. Active substances rotate the plane 

 of polarization of these rays in a sense contrary 

 to that of light. I observed rotations of 18 

 (note 2). 



It is extremely likely that magnetic rotation 

 also exists for "X" rays as well as for "S" 

 rays. One can also surmise that the properties 

 of these rays, with reference to polarization, 

 extend to tertiary rays, etc. I intend shortly 

 to publish the results at which I have arrived 

 concerning these different points. 



