CORRESPONDING SOCIETIES OF THE BRITISH ASSOCIATION. 12- 



to be especially numerous and powerful, if Palaeozoic rocks are 

 unusually near the surface there, a view to which I am myself 

 inclined. It would be interesting to compare with the record of an 

 instrument so placed, that of another at Culford, near Bury vSt. 

 Edmunds, where Palaeozoic rocks of doubtful affinities have been 

 found at a depth of only 63 7 ^ feet below the surface. And it is 

 evident that others are also desirable in districts where the earth- 

 quake was unfelt, and where Palaeozoic rocks (as near Battle, in 

 Sussex) are known to be at a great depth below, for the sake of 

 comparison with the results attained in differently constituted areas. 



Pollution of Air in Toiv/is. — Dr. G. H. Bailey gave some account 

 of the examination of the air of towns in vvhich they had been 

 engaged at Manchester, in connection with the Manchester Field 

 Naturalists. He had come to the conclusion that the amount of 

 the death-rate varied with the amount of the pollution in the air. 

 The diminution in the amount of sunlight or daylight in the 

 centres of large towns, as compared with their suburbs and with 

 the open country, might amount to fifty, sixty, or seventy per cent. 

 The work already done had been chronicled in the " Journal " of 

 the Manchester Field Naturalists for 1893. -^^ regards the effects 

 of smoke on plants, the Chairman (Professor Meldola) remarked that 

 cryptogams and lichens were once common on trees in Epping Forest 

 though now they are rare. 



Mr. W. Whitaker, F.R.S. (representing Section C), said that the 

 first subject to which he would refer was Coast Erosion. The final 

 report on this subject would be made next year, and the matter 

 would then be handed over to the local societies, when those which 

 had coast lines could register future changes on six inch maps. 

 The Committee dealing with the Circulation of Underground- 

 Waters would also issue their final report next year, and the local 

 societies would be able to continue the investigation. Twenty 

 reports had been issued, and it had been suggested that if the 

 material in them were arranged topographically, and possibly 

 rondensed, many local societies might be glad to have the volume, 

 which would probably form an octavo book of 250 to 300 pages. 



Professor Blake wished to inform the representatives of the local 

 societies that he was engaged in examining the microzoa of clays, 

 especially of Jurassic Clays, and would be much obliged if they 

 could send him samples. He would be glad to report to the senders 

 as to the general character of these clays and their microzoa. He 



