COREESPONDING SOCIETIES. 37 



occupied now in relation to tlie Association very much the same position 

 as one of its Sectional Committees, and for that they were very largely 

 indebted to Sir Douglas Galton, who had very keenly watched their 

 proceedings, and had taken a great interest in them. The report of the 

 Committee was then submitted, and the different subjects which had 

 engaged attention during the year were dealt with under the heading 

 of the Association Sections to which they belong. 



Section A. 



The Chairman introduced the subject of temperature variations in 

 lakes, rivers, and estuaries. 



Meteorological FhoiograpJnj. — Mr.Clayden and Mr. Symons spoke of 

 the desirability of obtaining photogi'aphs illustrating damage by whirl- 

 winds and floods, and Mr. W. Watts (Rochdale) said that the society 

 he represented was taking up the subject. Mr. Symons mentioned the 

 Helm Wind of Crossfell, and the peculiar cloud accompanying it ; photo- 

 graphs of the latter would be useful. Mr. Watts stated that a difficulty 

 in photographing the effects of floods arose from the state of the weather 

 during their occurrence, and Mr. Cashing (Croydon) exhibited photo- 

 graphs of a recent thunderstorm. The Chairman then remarked that 

 Mr. Kenward (Birmingham), who was unable to be present, had sent a 

 letter stating that for some years in Birmingham meteorological observa- 

 tions had been made in the building called ' The Monument.' 



Section B. 



The Chairman mentioned the subject of the conditions of the atmo- 

 sphere in manufacturing towns, and Mr. Mark Stirrup (Manchester) and 

 Mr. Watts (Rochdale) said that observations and experiments were l3eing 

 made thereon in their respective districts. 



Section C. 



Mr. De Ranee (Section C) stated that the Eighteenth Report of the 

 Committee on Underground Waters had been read that morning ; that 

 the Committee thought it should be reappointed, and that a volume 

 containing abstracts of the previous reports should be published. The 

 Committee on Coast Erosion hoped to conclude its labours next year. 

 The Committee on Erratic Blocks continued to do good work. The 

 local societies could do much to assist this committee by noting the 

 position of boulders, and by preserving them from destruction. 



Mr. Watts (Rochdale) spoke upon the denudation of high-lying 

 drainage areas, and some observations he had made on the amount of 

 material brought down by flood waters, and the degree of protection 

 given by heather, grass, and peat. He was anxious that other districts 

 should take up this inquiry in order that comparisons might be possible. 

 In his district he had found that flood water, after a very heavy flood, 

 had yielded 900 grains of fine material to the gallon, the material mainly 

 consisting of leaves, fibi-es, seed spores, and little bits of peat. 



Dr. H. R. Mill said that something had recently been done in Germany 

 to ascertain the amount of sediment in river water. He thought it very 



