238 Proceedings and List of Papers read. 



gen in one and not in the other, leaves the presence of free hydrogen 

 in the atmosphere as a question for further inquiry. The tube that 

 did not contain hydrogen was heated very hot in order to get a 

 discharge, and then the spectrum showed some bands like the negative 

 glow of nitrogen. Occasionally, a jar discharge was got to pass, and 

 when this took place the nitrogen lines could be seen. An electrodeless 

 tube filled carefully with oxygen made from fused chlorate of potash, 

 which was contained in an extension of the vacuum tube gave nothing 

 but the carbonic oxide bands. In future experiments it will he easy 

 to concentrate all the most volatile material in air or other gases, 

 and thereby to make a more thorough examination of the spectrum. 

 In the meantime my object is to show one of the scientific uses of liquid 

 hydrogen. 



I have to thank Mr. Robert Lennox for efficient aid in the conduct 

 of the difficult experiments. Mr. Heath has also helped in the work. 



January 19, 1899. 

 The LOED LISTER, F.R.C.S., D.C.L., in the Chair. 



A List of the Presents received was laid on the table, and thanks 

 ordered for them. 



The following Papers were read : 



I. " Observations upon the Normal and Pathological Histology and 

 Bacteriology of the Oyster." By Professor W. A. HERDMAN, 

 F.R.S., and Professor R. BOYCE. 



II. " On the Formation of Multiple Images in the Normal Eye." By 

 SHELFORD BID WELL, F.R.S. 



HI. " On the Vibrations in the Field round a Theoretical Hertzian 

 Oscillator." By Professor KARL PEARSON, F.R.S., and Miss 

 ALICE LEE. 



IV. " On the Refractive Indices and Densities of Normal and Semi- 

 normal Aqueous Solutions of Hydrogen Chloride and the 

 Chlorides of the Alkalis." By Sir JOHN CONROY, Bart., 

 F.R.S. 



