I 



CORRESPONDING SOCIETIES. 37 



definitely stated althougli still under discussion by arcbfeologists. If 

 errors of this kind were communicated to the Director-General of the 

 Ordnance Survey they would be attended to. As an instance he men- 

 tioned that a member of the Hampshire Field Club had discovered a 

 British earthwork which was not on the map ; this omission had been 

 made known to the Survey, and it was now being or would be surveyed 

 and inserted. 



Mr. Kenward stated that he had been able to do a similar thing in 

 the case of the unnoted Roman camp at Metchley Park, near Birmingham. 



Second Conference, August 25. 



The chair was taken by Mr. G. J. Symons,F.R..S., the Corresponding 

 Societies Committee being further represented by Sir Douglas Galton, 

 Mr. Whitaker, Dr. Garson, and Professor Meldola as Secretary. 



Section A. 



Temperature Variation in Lakes, Jtivers, and Estuaries. — Dr. H. R. 

 Mill, the Secretary of this Committee, stated that last year the Committee 

 had been recommended to draw up its fourth and final report. The 

 report which had been presented took the form of a discussion of the 

 observations which had been made during the past three years chiefly 

 through the agency of the various Corresponding Societies. Their Com- 

 mittee had been appointed about the time when the Conference of Dele- 

 gates had taken shape, and it was one of the first pieces of work recom- 

 mended to be taken up. The object was to ascertain by observations, 

 taken twice daily, the temperature of rivers, estuaries, and lakes in all 

 parts of the kingdom. A very good beginning was made in England, 

 Scotland, and Ireland, but unfortunately the Irish observations were 

 not continued, some of the observers writing to say that they had com- 

 menced observations but were tired of them, and others that they could 

 see no good in them. The Cardiff' Naturalists' Society had distinguished 

 itself by the energy with which the subject had been taken up. 

 Dr. Mill exhibited a diagram which he had prepared, showing the results 

 of two sets of observations, the first set made in the River Tafif in the 

 Castle grounds, and the second set in the Bristol Channel from one of the 

 lightships. The curve drawn from the first set showed the temperature 

 during the winter months and the way it varied, falling greatly during 

 cold weather and rising rapidly during warm weather. The curve drawn 

 from the second set showed that the water in the Channel was generally 

 at a higher temperature, and that it kept its temperatm-e more uniformly. 

 In fact the temperature frequently rose when the land teraperatiire fell, 

 and fell when the land temperature rose. The subject had also been in- 

 vestigated by the Fishery Board of Scotland, whose report was being 

 published. The observers at Rochdale and Oldham had also made an 

 extremely valuable series of observations, some of which had been pub- 

 lished by the Rochdale Society. The same thing had been done by the 

 Manchester Geological Society in connection with the Oldham observa- 

 tions to which he had referred. The East Kent Natural History Society 

 had made careful observations in the River Stour, which were accom- 

 panied by a series of reports drawn up by Colonel Horsley. These reports 

 would be published in extenso. Observations had been made in the sea 

 at Dover with the object of ascertaining whether any diff'erence was pro- 



