542 SECTIONAL TRANSACTIONS.— B, C. 



curiosities rather than as important processes which may afford some insight into the 

 mechanism of the transfer of energy between molecules. Amongst those reactions 

 which exhibit the phenomenon of light emission to a marked extent and which can 

 be demonstrated are : — 



(1) Excitation of Light Emission by Physical Processes, 

 (a) The crystallisation of arsenious oxide from supersaturated solutions. 

 (6) The emission of light after light absorption by ' phosphors.' 

 (c) The emission of light after electron collision by ' phosphors.' 



(2) Light Emission in Oaseous Reactions. 



(a) The oxidation of phosphorus vapour and its inhibition by vapours of organic 

 compounds. 



(b) The cold autoxidation of ether vapour. 



(c) The interaction of chlorine and acetylene. 

 \d) The interaction of chlorine and ammonia, 

 (e) The decay of active nitrogen. 



(/) The gaseous and surface catalysed interaction of the vapours of potassium 

 and mercuric chloride. 



(3) Light Emission in Solution. 



(a) The oxidation of phosphorus in acetic acid by hydrogen peroxide. 



(b) The interaction of pyrogallol-formaldehyde mixtures and hydrogen peroxide. 



(c) The interaction of phenylmagnesium iodide and chlorpicrin. 

 \d) The oxidation of siloxene. 



Prof. J. C. Drummond. — The Luciferin-Luciferase System. 



Exhibition of Cinematograph Films (as on Friday, September 7). 



Afteknoon. 

 Visit to Corporation Gas Works, Maclaurin Plant, Dalmarnock, 

 Provan Gas Works, and Provan Chemical Works. 



Visit to Eoyal Technical College, George Street. 



Tuesday, September 11. 



Discussion on Recent Advances in Stereo-chemistry. (Sir William Pope, 

 F.R.S., Dr. H. J. Backer, Prof. C. S. Gibson, Prof. J. Kenner, 

 F.R.S., Dr. N. V. Sidgwick, F.R.S., Prof. G. T. Morgan, F.R.S., 

 Dr. J. Kenyon.) 



Exhibition of Cinematograph Films (as on Friday, September 7). 



Afternoon. 

 Visit to Works of Messrs. Shanks & Co., Ltd. 



SECTION C— GEOLOGY. 



{For reference to the publication elsewhere of communications entered in the 

 following list of transactions, see p. 684.) 



Thursday, September 6. 



The Geology of the Glasgow District. 



(a) Prof. J. W. Gregory, F.E.S. — General Geology. 

 (6) Dr. G. W. Tyrrell. — Igneous Rocks. 

 (c) Dr. J. Weir. — Palceontology. 



