March yth, ipi6.] Proceedings. xxxi 



When a flame is produced by coal gas issuing from a small 

 circular nozzle a small obstacle placed at the centre of the flame, 

 at a critical distance a few inches above the aperture, gives rise 

 to a musical note of high frequency. If two such flames are 

 made to impinge, roaring or musical flames result. Burners of 

 the Bray and Meker type were shown to have special properties. 

 An experiment of great interest enabled the eddy currents pro- 

 duced by a flame from a triple nozzle to be studied. When the 

 flame is adjusted — so as to be central within a wide glass 

 tube — carbonaceous particles are precipitated from the flame 

 and these are whirled in an infinite variety of curves round the 

 flame mantle. The effect is more marked when benzine is 

 introduced into the coal-gas. 



Dr. J. H. Smith, F.I.C., read a paper entitled " A resume 

 of work on the bleach-out process of colour photo 

 graphy." 



This paper will be printed in full in the Memoirs. 



Ordinary Meeting, March 7th, 19 16. 



The President, Professor Sydney J. Hickson, M.A., D.S.c, F.R.S., 

 in the Chair. 



A vote of thanks was accorded the donors of the books 

 upon the table. The accessions to the Society's library included : 

 '''Numbers, Variables and Mr. RusselPs Philosophy,''' 'by R. P. 

 Richardson and E. H. Landis (8vo., Chicago and London, 1915) 

 and "Fundamental Conceptions of Modern Mathematics, Variables 

 and Quantities" by R. P. Richardson and E. H. Landis (8vo., 

 Chicago and London, 19 16), presented by the Authors ; " The 

 Principles of Plant-Teratology," by W. C. Worsdell, vol. I. (8vo., 

 London, 1915) and " The British Freshwater Rhizofoda and 

 Heliozoa, Vol. III. ' Rhizopoda; Part iii." by G. H. Wailes 



