ACTION OF A BEAM OF LIGHT ON THE EYES 47 



are not without influence on certain phenomena 

 of animal and vegetable life. 



The following are further observations con- 

 cerning the strengthening action of " N " rays 

 on luminous rays. 



It is sufficient for the production of the 

 phenomenon that the " N " rays reach the eye, 

 no matter how, even laterally. This seems to 

 indicate that the observer's eye behaves like an 

 accumulator of " N " rays, and that it is these 

 rays accumulated in the media of the eye which 

 act on the retina, jointly with luminous rays. 



It matters little whether in these experiments 

 the rays are emitted by a body previously 

 exposed to the sun, or are primary rays, pro- 

 duced for instance by a Nernst lamp. 



Sodium hyposulphite, whether solid or 

 dissolved in water, constitutes a powerful accu- 

 mulator of " N " rays. 



