76 rnocEEDixGS of tke 



Dr. AV. B. Kussell writes : " It used to be so abundant in the 

 Derwent at Maltou, 30 or 40 years ago, as almost to block the river. 

 It is now almost extinct, being replaced by Potamogeton j)ectinatus.^' 



Mr. Fox Lea : " In canals, Dewsbury and other still waters, 

 pouds, &c. liiver Wbarl'e at llkley, 1909. ]S'ot so abundant as 

 formerly." 



Lincolnshire. 



Mr. Douglas AVitty (llydal Mount, Colwyn Bay), writes that 

 " it is generally spread over all North Lincolnshire. In the 

 Aucholine valley it is met with practically everywhere. In the 

 Upper Ings Drain (near Barton-on-lluraber) it has increased 

 very considerably in the last decade, and has with other water- 

 growths seriously obstructed tlie flow of the stream at times. 



NORTllU.MBERLAND and DUEHAM. 



C. E. Eobson, Hon. Sec, Nat. Hist. Soc, Northumberland, 

 Durham, &c., writes : " There are no canals in the district, and 

 the rivers being swift-flowing and not wide the plant is practically 

 unknown." 



N. AVales. 



Merioneth. — Mr. D. A. Jones, Eock House, Harlech, writes : 

 '• I found it three years ago in Llyn Gwernen, 2 miles from 

 Dolgelly. It is the only record I have for the County." (Mr. H. E. 

 Forrest says D. A. J. is the authority on the Flora of Merioneth.) 



Montuomery. — Mr. D. A. J. says it grows at Llanymynech. 



Denbighshire. — Same authority says it grows at Gresford. 

 Mr. T. K., per Mr. H. E. Forrest, says it is found in the canal 

 2 to ;3 miles from Llangollen as " an ordinary humble weed," not 

 choking any part of the canal. A. 0. Walker remembers it about 

 30 years ago completely filling up the canal there. 



Scotland. 



Glasgow District. — Mr. J. E. Lees (Glasgow Nat. Hist. Soc.) 

 M-rites : " Occurs in the Forth and Clyde Canal and in a number 

 of the small streams, ponds, and lakes near Glasgow. Not nearly 



so abundant as about 20 years ago Seems to be rapidly 



disappearing in most parts of the district." 



BiiRWiCKSHiRE. — First record for Gt. Britain in Dunse Loch 

 bv Dr. G. Johnston in 1842. 



" ]SLE OF BuTi;. — " Stream at Eothesay," W. H. Heathcote, Sec. 

 Preston Scientilic Society; also 



Inverness, mill stream near, AV. II. H. 



Perthshire. — Mr. E. Barclay reports {D: "In Tay, Earn, 

 Isla, Towns Lade, Moncreiffe Pond, and very many other ponds 

 throughout the County. (2) Occurs in more localities " (than 



