22 " N RAYS 



instead of a very small, brilliant point, a lumin- 

 ous patch of about 2 cms. diameter, of much less 

 luminosity, whose variations can be far better 

 appreciated by the eye. 



The action of an incandescent body on a 

 flame, or that of a flame on another flame, is 

 certainly a common phenomenon. If it has re- 

 mained unnoticed up to the present, it is 

 because the light of the source prevented the 

 observation of the variations in glow of the 

 receiving flame. 



Quite recently I observed another effect of 

 the " N " rays. It is true that these rays are 

 unable to excite phosphorescence in bodies 

 which can acquire this property under the 

 action of light, but when such a body calcium 

 sulphide, for instance has previously been ren- 

 dered phosphorescent by exposure to sunlight, 

 if it is then exposed to " N " rays for instance, 

 to one of the foci produced by a quartz lens the 

 phosphorescent glow is observed to increase in 

 a very marked fashion ; neither the production 

 nor the cessation of this effect appear to be 

 absolutely instantaneous. Of all the actions 

 producing " N " rays, this is the one which is 



