TRANSACTIONS OF SECTION B. 387 



8. Report on Plant Enzymes. — See Eeports, p. 85. 



9. Report on Crystalline Form and Molecular Structure. 

 See Eeports, p. 85. 



10. Report on Natural Plant Products of Victoria. — See Eeports, p. 86. 



11. Report on Influence of Weather Conditions on the Amorint of 

 Nitrogen Acids in Rainfall and the Atmosphere. — See Eeports, 

 p. 87. 



12. Report on Non-aronmtic Diazonium Salts. — See Eeports, p. 95. 



13. Report on Botanical and Chemical Characters of the Eucalypfs. 



See Eeports, p. 97. 



14. Papers on Flame and Combustion, with Experimental Illustration : 



(a) The Explosion of Gases. By Professor H. B. Dixon, F.R.S. 



(h) The Dilution Limits of Inflammability of Mixed Inflammable Gases 

 with Air. By Dr. H. F. Coward. 



(c) Gaseous Combustion at High Pressures. 

 By Professor W. A. Bone, F.R.S. 



THURSDAY, SEPTEMBER 9. 

 Tlie following Discussion took place : — 



Discussion upon Smoke Abatement and Air Pollution. 



(Ordered by the General Committee to be printed in extenso. Edited by 

 Professor W. A. Bone, F.R.S., President of the Section.) 



(i.) The Work of the Manchester Air Pollution Advisory Board.''- 



Mr. E. D. Simon (Manchester). — The discussion was opened by Mr. E. D. 

 Simon, Chairman of the Air Pollution Board appointed by the Manchester 

 Corporation in 1912, with the object of diminishing atmospheric pollution by 

 smoke by means of propaganda and research instead of the older method of 

 prosecution. It had been estimated that the measurable damage done in Man- 

 chester and Salford by smoke amounts to nearly 1,000,OOOZ. per annum, in 

 addition to the immeasurable evil effects of smoke and fog upon public health. 

 Research had mainly been directed towards (1) a more correct ascertainment of 

 the damage done by smoke, and (2) means for reducing both domestic and 

 factory smoke, including all the general problems of smokeless combustion and 

 the electrical deposition of soot and dust. As regards factory smoke, the chief 

 problems are the design of mechanical stokers and the supply of air at the 

 correct point to ensure smokeless combustion, and they can only be solved by 

 large-scale experiments carried out either by, or in conjunction with, manu- 

 facturers. However, inasmuch as efficiency and smokelessness usually go 



> See Rejtort of the Sanitary Comm-ittca of the City of Manchester on the 

 t>uhject of .Air Pollution, Aipvil 191.5. 



C C 2 



