Proceedings. 3 



a state of constant and intense vibration, a sort of 

 shivering or trembling of the mote per se. Besides this, 

 each mote appears as if it had a pair of wing-Hke 

 appendages. The motes are very small, and appear of 

 equal dimensions. When any two motes seem to approach 

 each other, this arises from the fact that they get behind 

 each other, which is proved by the motes getting out 

 of focus. No one can see this experiment without being 

 struck with its beauty and its remarkable character. 

 What are those wing-like appendages ? I think they have 

 nothing to do with the motes, and I do not think they are 

 optical illusions." 



A discussion ensued, in which Professor SCHUSTER, 

 Professor Reynolds, Dr. G. H. Bailey, Mr. W. 

 Thomson, and others, took part ; and eventually it was 

 resolved to adjourn the debate in order that the experiment 

 might be tested. 



