66 KNUBLEY: THE BRITISH ASSOCIATION AT CARDIFF. 
SECTION B. 
Inquiry into the Condition of the Atmosphere of 
Manufacturing Towns.—Professor Meldola said that he had 
received a letter from Mr. J. R. Ashworth, the Secretary of the 
Rochdale Literary and Scientific Baciety, asking whether it would be 
of use for the British Association to appoint a Committee for this 
subject, which was attracting some attention in Manchester at the 
present time. 
Mr. Mark Stirrup said there was a Committee in Manchester 
nary collecting information with respect to the exceptional atmosphere 
at town, and its effect on vegetation.* The investigation was 
eoing on, and the report would be published by the Society; if any 
of the Delegates desired copies, he would be happy to forward them 
on application. He suggested that other tewns might be induced to 
carry on similar work. 
The Chairman said that the Manchester Corporation had recently 
started a meteorological paige he in the centre of the town, under 
the guidance of Dr. Tatham. He referred to the use of ozone 
papers, which had been shown by chemists to be coloured by several 
other gases besides ozone. Thirty years ago he had made some 
experiments in London, with identical test-papers, which had been 
exposed in different parts of the town. He found that, in whichever 
direction the wind blew, the air coming from the country always 
coloured the papers more or less, but air which had passed over the 
town always lost the power of colouring the papers. It appeared to 
him that some simple test of this kind was wanted, if it could only 
be made reliable. Mr. Symons also called attention to the fact that 
the Royal Horticultural Society had appointed a Committee for inves- 
tigating the atmosphere of London in relation to fog and plant-life. 
r. Mill referred to the excellent work which the late Professor 
Carnelley had carried out in connection with the determination of 
the number of micro-organisms present in the atmosphere of 
rooms, etc. 
Section C, 
Erratic Blocks.—The work of this Committee was not this 
year formally brought before the delegates, but the nineteenth 
Report, which contained numerous contributions from Yorkshire, 
was read in the Geological Section, and the Committee was 
re-appointed, Dr. Crosskey, in presenting the Report, said that, 
owing to landscape gardening, burying, blasting, and building, 
* The Town SRE: Committee of the Manchester Field Naturalists’ and 
Archzologists’ The ary is Mr. Alfred Griffiths, 16, Kennedy 
Street, Albert hoe Wikdee [Sec. Corres. Soc. Comm. ] 
Naturalist, 
