

NOTES ON THE AGRICULTURE, 



XLVII. On Photoplankton prom the Ponds of Tientsin. 



Phacu8 orbicularis Hiibner. 



Phacus Nord8tedtii Lemm. 



Phacus acuminata Stokes. 



Phacus 08cillans Klebs. 



Lepocinclis ovum (Ehrenb.) Lemm. 



Lepocinclis texta Lemm. 



Phacotus lenticularis (Ehrenb.) Stein. 



Melosira islandica 0. Mull. var. helvetica O. Miill. 



Cymbella cuspidata Kiitz. 



Navicula cuspidata Kiitz. 



Suri reiki ovalis Breb. 



Oscilhiria princeps Naucli. 



Stigcoclonium tenue Kiitz. 



XL VIII. — On the Winter Phytoplankton of the 

 Fish-ponds of Foochow. 



Being in Foochow in 1918 some observations were made 

 1>\ me during the winter time on the life of the plankton of 

 t In- fishponds. 



The Fishponds at Foochow are very numerous ; they are 



mostly small in size, but usually very deep. In summer 



because of rain fall the water in these ponds has usually 



a dark muddy colour, only in winter the water was clean 



and in it were found a rich plankton. In the middle of 



1 >ecember up to the end of March most of the ponds 



were green-blue in colour by an immense growth of Blue- 



n A Igal CJathrocystis aeruginosa Hen. or of a mixture 



llenaceae plankton, containing different forms. Only the 



of one pond was full of Euglena sanguinea. 



Foochow also it was observed that the Conjugateae 



Spirogyra, Maugeotia, Zygnema and various Desmidiaceae 



