LINNEAN SOCIETY OF LONDON. 75 



NOTTINGHAMSHIKE. 



" Common iu rivers, brooks, canals, and ponds throughout the 

 County." 



" My own experience of 20 years is that it is not increasing, 

 but that if there is any change at all it is in the direction of a 

 slow decrease in abundance." Prof. J. W. Carr. 



Northamptonshire. 



" It occurs in rivers and ponds in all the districts of 

 Northants " (Druce in Journ. Northants Nat. Hist. Soc, vol. iv. 

 p. 121, 1886). 



Mr. Druce writes to Mr. H. N". Dixon : " My own impression 

 is that although Elodea was common in the Grand Junction Canal, 

 and I can remember it in 1860 both in Northants and Bucks, it 

 ■was never a pest. In the sixties it was, however, a great pest in 

 artificial pieces of water such as the Wakefield [Laun] Ponds, 

 where it had to be frequently cut. It is certainly less common 

 now." 



First record 1841, Watford Locks, G, J. Canal. 



Mr. H. N. Dixon, Hon. Sec. Northants Nat. Hist. Soc, says: 

 " It is just now a great pest iu the artificial water of Moulton 

 Grange, the residence of Mr. H. Maufield, M.P." 



Lancashire. 



Mr. W. H. Heathcote, Hon. Sec. Preston Scientific Soc. : 

 " Very abundant in the Preston and Lancaster Canal ; Leeds and 

 Liverpool Canal ; Eivers Eibble and AVyre ; numerous ponds, &c. 

 I should say more abundant" (tlian formerly). 



" Ponds and ditches, common " (Flora of Preston and neigh- 

 bourhood by members of the Preston Scientific Soc, 1903). 



' Flora of Liverpool District,' C. T. Green, 1902 : " Frequent in 

 canals, ditches, and old ponds," Liverpool and Wirral. 



Yorkshire. 



Mr. F. Jowett, Hon. Sec. Bradford Nat. Hist. Soc. : " Aire 

 about Skipton ; Leeds and Liverpool Canal ; mill dams all over 

 the district ; common in wet ditches. The plant is holding its 

 own in all places except in the canal, where it is probably cut uj) 

 by the screws of the boats." 



Mr. F. Barker, Hon. Sec. Halifax Scientific Society : " Very 

 common Calder and Hebble Canal between Halifax and Salter- 

 hebble. Several mill dams in the neighbourhood ; very firmly 

 established. Opinions differ" (as to its being more or less 

 abundant than fornierlv). 



' Flora of N. Yorkshire,' J. G. Baker, 1863 : "The Wiske and 

 ponds at Kirby Wiske. Clifton Ings ditch; Foss Islands near 

 York." In 1909 J. G. B., writes : " It has never been abundant 

 in the North Riding." 



' Flora of E. Eiding,' J. F. Eobinson, 1902. " Common in dykes 

 and drains, but scarcely so conspicuous as it was 12 years ago." 



