170 



NATURAL SCIENCE. 



March, 



add, we have examined the plankton of the pond near Biechovic 

 every fortnight, paying special attention to infusorians and rotifers. 



Last summer I visited two biological stations in Germany, and 

 published in MiWifilungen des Oestcrreichischen Fischerei-Vereines (No. 

 65, Wien, 1896), a paper entitled, " Eine Studienreise in Angelegen- 

 heiten der Fischerei." As the information may assist your proposal, 

 and is not likely to be accessible to your readers, I venture on an 

 extract or two. 



The biological and fishery station on the Muggelsee near Berlin 

 is close to the great water-works of Friedrichshagen, built at a cost 

 of /"i, 000, 000 to supply the capital with water. These waterworks 



The Biological and Fishery Station on the Muggelsee. 



supply the station gratis with a definite quantity of water ; not, how- 

 ever, with enough for the experimental . basin, to which water is 

 to be pumped from the lake by a motor next year. 



" Professor Frenzel was waiting for us, and was kind enough to 

 explain the arrangement of the station in detail. On the sandy, 

 slightly shelving shore of the lake, in a fir-wood, stands a small one- 

 storeyed cottage with four chambers, two workrooms, an aquarium- 

 room, and the servant's lodging. The workrooms have each about 

 the size of our moveable stations, but suffice for the work of an 

 unassuming naturalist. The tanks in the aquarium are of cement, 

 rendered harmless, when finished, by glowing charcoal ; many smaller 



