Stubies on tbe ©ccurrcnce anb IReprobuction 
of Bntisb freshwater aio^ in ligature.' 
2. A Jive years observation of the Fish Pond, Abbot's Leigh, 
near Bristol, 
By F. E. Fritsch, D.Sc., Ph.D., F.L.S. 
(University and East London Colleges, University of London), 
and Florence Rich, M.A. 
^.—introductory. 
rilHE study of freshwater algal biology is a fairly recent one. Its 
X commencement dates some twenty years back,^ when the methods 
of marine Plankton-research were applied to the study of freshwater 
Plankton Muth results that proved of sufficient value to stimulate a 
whole host of continental workers to take up this line of research. 
Soon afterwards the first contribution dealing with the biology of 
freshwater algal grovv^th in general appeared in the shape of Chodat’s 
well-known “Etudes de biologie lacustre,”^ and a somewhat earlier 
paper by Schmidle^ in the Flora for 1894. The first paper to deal 
seriously with the periodical phenomena of macroscopic algal growth 
was that published by one of us® in 1903; this was followed in 1906 
by a more detailed discussion® of the chief problems awaiting solution 
in the realm of algal biology, the method of research and the main 
points brought forward in the paper being illustrated by a series of 
periodical observations made on a pond at Telscombe, near Newhaven. 
In the interval that elapsed between these two papers there appeared 
contributions by Norman Walker^ on the Brainhope ponds, near Leeds, 
and by J. Coraere^ on the periodicity of the algal flora in the I’egion of 
^ The first paper of this series was published in Annals of Botany, Vol. xxi., 
July, 1907, p. 423—436. 
■^Hensen, Das Plankton der ostlichen Ostsee und des Stettiner Haffs. 6. 
Bericht d. Commission z. wiss. Unters. d. deiitsehen Meere, 1890. 
^ Bulletin de FHerbier Boissier, Vol. v., No. 5, 1897, and Vol. vi., No. 0, 
1898. 
^Schmidle, Aus der Chlorophyceenflora der Torfstiche zu Virnheim. Flora, 
Vol. Ixxviii., 1894. 
® F. E. Fritsch, Algological Notes. — IV. Remarks on the Periodical Develop- 
ment of the Algse in the artificial waters at Kew. Annals of Botany-, 
Vol. xvii., 1903, p. 277. 
“F. E. Fritsch, Problems in Aquatic Biology, etc. New Phytologist, Vol. v.. 
No. 7, 1906, p. 149, et seq. 
N. Walker, Pond Vegetation. Naturalist, October, 1905, No. 585, p. Sll. 
® J. Comere, Observations sur la periodicite du developpement de la fiore 
algologique dans la region toulousaine. Bull. Soc. Bot. de France, t. liii. , 
1906, p. 390, et seq. 
