500 report- 1878. 



2. If during this vibration the tin-foil on the cylinder be passed in front of the 

 needle, the vibrating needle stamps a wave-trace on the tin-foil. 



3. The tin-foil preserves this trace during its subsequent motion. 



4. If at any subsequent time the stamped tin-foil passes in front of the needle 

 when it is not vibrating (the analogue of a cold atom), the needle is caused to 

 vibrate in the same period as before. 



These analogies would be more perfect if the needle were set into vibration by 

 being attached to a tuning-fork of definite period of vibration. 



It appears, then, that the co-existence of such vortex atoms and ultramundane 

 corpuscles as Sir William Thomson has devised leads to the conclusion that hot 

 bodies must emit radiations which may be absorbed by cold bodies. The question 

 naturally arises, Can this action be the keystone to a new theory of light ? Can 

 the phenomena of reflection, refraction, interference, diffraction, and polarisation be 

 explained by this kind of action ? In answer to these questions it can at present 

 only De said that the germs of a complete theory of light do exist in this speculation. 



