132 Transactions. 



modes and effects of pollution of the same. In describing- these 

 he dwelt at some length on the lessons to be learnt from the 

 Broad Street pump epidemic and the more recent outbreak of 

 cholera at Hamburg, drawing attention to the efficacy of pro- 

 perly prepared and kept sand filters. 



20th April, 189Jf. 



Mr Thomas M'Kie, F.S.A., Vice-President, in the chair. 



New Members. — Mr Alexander Malcolm of Priestlands House, 

 and the Rev. H. M. B. Reid of Balmaghie. 



Donations. — The Proceedings of the Linnean Society, 1875- 

 18S6 (from Mr W. Robinson Douglas) ; the Report of the Smith- 

 sonian Institution, Washington, for 1891 ; Cardiff Naturalists' 

 Society Report, 1892-3 ; History of the Berwickshire Naturalists' 

 Club, 1892 ; Transactions of the Botanical Society of Edinburgh, 

 1892-3; Essex Naturalist, October-December, 1893. 



Exhibit. — Mr Peter Gray exhibited a specimen of the gcifjaa 

 Intca, found at The Grove. 



Communications. 



1. — Notes on the Plants of Northumberlmid and Durham, in 

 relatiofi to their extension Northivards to Dumfries., Kirk- 

 cudbright, and Wigtown. 

 By Mr Arthur Bennett, F.L.S., Croydon. 



If you look at a map of Great Britain you will see that 

 Northumberland extends some 20 miles northwards of the most 

 northerly point of any of the three Scotch counties named above ; 

 and that the extreme southern point of Wigton about cuts the 

 two counties of Durham and Cumberland into equal portions, thus 

 including under equal latitudes some 70 miles south to north of 

 England and Scotland. 



In 1868 Mr J. G. Baker, in the Flora of Northumberland and 

 Durham, gave a list of species which, while reaching these two 

 counties, failed to reach Scotland. 



They numbered 77 species. 28 of these reach Cheviotland, 

 18 stop short in Tyneland, and 31 in Durham. Looking to these 



