viii Proceedings. S^November 12th, jgoi. 



Ordinary Meeting, November 12th, 1901. 

 Charles Bailey, F.L.S., President, in the Chair. 



The thanks of the members were voted to the donors of 

 the books upon the table. 



Mr. VV, B. Faraday, LL.B., showed a stone adze, one of 

 several similar implements which have been found from time to 

 time near Leek. He suggested a comparison with the eolithic 

 stone implements recently shown to the Society by Mr. R. D. 

 Darbishire. 



Dr. C. H. Lees described the Hampson air-liquefying 

 apparatus presented to the Physical Laboratories of the Owens 

 College by Sir Henry E.Roscoe. After explaining the principle 

 on which the action of the apparatus depends, and describing 

 the experiments of Joule and Thomson, which led to the dis- 

 covery of that principle. Dr. Lees gave a resume of our present 

 knowledge of the properties of liquid air and of other bodies 

 when cooled down to the temperature of liquid air. 



Dr. Lees illustrated his remarks by experiments, which 

 included the following : — Liquid air boiling in an ordinary test- 

 tube ; liquid air quiescent in a Dewar vacuum vessel ; liquid air 

 boiling in a cup of ice ; liquid air floating on water ; ignition of 

 glowing splinter of wood when immersed in liquid air ; india- 

 rubber, fruit, and raw meat shown to become rigid and brittle at 

 the temperature of liquid air ; frozen mercury joint between two 

 bars of metal, under tension ; bar of mercury forged into a hook 

 from which weights were suspended ; absolute alcohol frozen in 

 liquid air. 



A discussion ensued as to the industrial applications of liquid 

 air, in which Dr. F. H. Bowman, Mr. W. Thomson, and others 

 took part. 



