MEMOIRS AND PROCEEDINGS 



OF 



THE MANCHESTER LITERARY AND 

 PHILOSOPHICAL SOCIETY. 



Ordinary Meeting - , October 3rd, 1893. 



Professor OSBORNE REYNOLDS, M.A., LL.D., F.R.S., 

 Vice-President, in the Chair. 



The thanks of the members were voted to the donors 

 of the books upon the table. 



Mr. T. E. STANTON, B.Sc , read a paper on " Experi- 

 ments on the relation between Permanent Strain and Uni- 

 form Stress in Wrought Irons." 



Dr. G. H. Bailey read a paper entitled " Some Aspects 

 of Town Air as contrasted with that of the Country," in 

 which he dwelt on the importance of quantitative investi- 

 gations as to the impurities other than carbonic acid present 

 in air as a measure of pollution, and urged that, however 

 minute the quantities may be, they are sufficientto bringabout 

 serious disorganization in plant life and in human beings. In 

 illustration Dr. Bailey presented tables showing considerable 

 variations in the quantity of sulphur compounds present in 

 different localities in Manchester and London on clear days 

 and on slightly or densely foggy days. Some surprise was 

 caused by a table showing that during the dense fogs of 

 December last in Manchester and London there was a much 

 larger proportion of sulphur compounds present in the 

 London than in the Manchester air, notwithstanding the fact 

 that the coal consumed in Manchester is generally understood 

 to be much more sulphurous than that burnt in London. 

 Professor Weiss confirmed the statement made by Dr. 

 Bailey. 



