knubley : the british association. 349 



Temperature Variation in Lakes, Rivers, and Estuaries. 

 — Dr. H. R. Mill, of the Royal Scottish Geographical Society, drew 

 attention to the report of the Committee on the Surface Temperature 

 of Rivers and Estuaries, and said he should be glad if the delegates 

 present representing societies which had not yet seen their way to 

 take up the work of making observations on the waters in their own 

 neighbourhood, would endeavour to find out some of their members 

 who would be able and willing to make such observations. If they 

 would communicate with him, instructions would be immediately 

 sent out for setting the observations a-going. 



Mr. J. Brown, of the Belfast Natural History Society, thought 

 the work might be taken up by the rainfall observers. 



Mr. A. S. Reid, M.A., said that the East Kent Natural History 

 Society had taken up the work. 



Underground Waters. — -Mr. De Ranee said that the Com- 

 mittee was appointed to inquire into the water obtained from the 

 New Red Sandstone and Permian formations, as a source of water- 

 supply to towns. A series of questions had been drawn up, which 

 practically grasped the whole subject, and they would be supplied to 

 those provincial secretaries who might desire to have them. 



Erratic Blocks. — Dr. Crosskey, in presenting his seventeenth 

 Report to the Geological Section, stated that care should be taken 

 to note the point of origin of the boulders, their elevation and 

 distribution, and whether they ever occurred in relation to shell-beds, 

 and said that their position should eventually be marked on contour 

 maps. He held up the Yorkshire Naturalists' Union as an example 

 for other counties to follow. In answer to Mr. W. Grey, Mr. De 

 Ranee said it was important that the boulders of Ireland should be 

 recorded in the same manner as they were in England, and suggested 

 that a Committee might be formed in Ireland, which would eventually 

 be amalgamated with the present English Committee. 



Sea-Coast Erosion. — Mr. W. Topley asked local societies to 

 note how far the rate of erosion had been accelerated by artificial 

 means, such as by the removal of shingle, the erection of buildings, 

 or by sea-walls constructed on false principles. He asked them to 

 consult old plans, documents, and deeds, and suggested that local 

 observers might take measurements from some known spot to the 

 sea, and in a year or two take other observations, and by this means 

 ascertain the amount of erosion which was taking place. 



Geological Photographs. — Prof. Lebour said that the recom- 

 mendation which had been sent from their last meeting had been 

 received with the greatest unanimity by the Committee of the 

 Geological Section. They had appointed a Committee for making 



Nov. 1889. 



