

A HISTORY 



OF THE 



BRITISH 



FRESHWATER ALGJl, 



INCLUDING DESCRIPTIONS OF 



THE DESMIDEiE AND DIATOMACEiE. 



WITH 



UPWARDS OF ONE HUNDRED PLATES, 



ILLUSTRATING THE VARIOUS SPECIES. 

 BV 



ARTHUE HILL HASSALL, 



FELLOW OF THE LINN^AN SOCIETY; 



MEMBER OF THE ROTTAC COIXEGE OF SURGEONS, LONDON. AND OF THE rX)NDOK 

 BOTANICAL SOCIETV ; AND CORRESPONDING MEMBER OF THE DUBLIN 



NATURAL HISTORY SOCIETY, 



IN TWO VOLUMES. 



VOL. I. 



LONDON: 



S. tHiaHLEY, 32. FLEET STREET ; 



AND H. BAILLIERE, 219. REGENT STREET. 



EDINBURGH; SUTHERLAND & KNOX, 58. PRINCE'S STREET. 



PARIS : J. B. BAILLIEKE. LEIPSIG : T. O. WEIGEL. 



1845. 



