A HISTORY

OF THE

BRITISH

FRESHWATER ALGAE,

INCLUDING DESCRIPTIONS OF

THE DESMIDEA5 AND DIATOMACEJ!.

WITH

UPWARDS OF ONE HUNDRED PLATES,

ILLUSTRATING THE VARIOUS SPECIES.

BY

ARTHUR HILL HASSALL ,

FELLOW OF THE LINN.LAN' SOCIETY;

MEMBER OF THE ROYAL COLLEGE OF SURGEONS, LONDON , AND OF THE LONDONBOTANICAL SOCIETY ; AND CORRESPONDING MEMBER OF THE DUBLINNATURAL HISTORY SOCIETY'.

IN TWO VOLUMES.

VOL. I.

LONDON :

S. IIIGIILEY, 32. FLEET STREET;

AND H. BAILLIERE, 219. REGENT STREET.EDINBURGH : SUTHERLAND & KNOX, 58. PRINCE’S STREET.PARIS : J. B. BAILLIERE. LEIPSIG •. T. O. WEIGEL.

1845.

Institut fur spezielle Botanik

derEi dgenftssischen T echnischen Hochschule