Proceedings. 



Ordinary Meeting, October i8th, 1892. 



Professor Arthur Schuster, Ph.D., F.R.S., F.R.A.S., 

 President, in the chair. 



The thanks of the members were voted to the donors of 

 the books upon the table. 



The Society's EDITOR exhibited a specimen copy of the 

 memorial volume on the life and work of Dr. James 

 Prescott Joule, written by Professor OsBORNE Rey- 

 nolds at the request of the Council, and forming Vol. VI. 

 of the Fourth Series of the Memoirs mid Proceedings^ 

 and it was moved by Dr. BOTTOMLEY, seconded by Mr. 

 Charles Bailey, and resolved, 



" That the thanks of the Society be given to Dr. Reynolds 

 on the completion of his laborious work for the Society, in 

 writing the Memoir of Dr. James Prescott Joule." 



Dr. Reynolds briefly acknowledged the resolution, and 

 expressed his sense of indebtedness to various members for 

 assistance in collecting facts, in superintending the engrav- 

 ing of the frontispiece, and in the revision of the proofs. 



Mr. W. Thomson, F.R.S. Ed., gave an account of an 

 attempt to repeat the experiment described in a paper by 

 Mr. Hovenden, read at the previous meeting, showing 

 " Brownian " movements of the particles of tobacco smoke 

 when seen under the microscope. Mr. THOMSON said that 

 he had tried the experiment by putting tobacco smoke in a 

 test tube and also in a "live" cell box. At first he saw 

 nothing but fog, but on keeping the eye steadily on the fog,, 

 he saw bright particles rushing violently about in all direc- 

 tions. He saw nothing of the nature of wings to the 

 motes, and he was under the impression that what he saw 

 was an optical illusion. The appearance he mentioned was 



