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In 1935 the author published the results of her studies on the ecology of fresh-water sponges collected from 103 lakes and 15 streams in Vilas and Oneida Counties in Wisconsin. In continuing these studies an effort has been made to extend the field observations over a wider variety of habitats, and to check conclusions based upon field work by experimental rearing of sponges in chemically modified waters. These studies were made at the Wisconsin State Biological Survey headquarters at Trout Lake, Wisconsin, during the summers of 1935, 1936, and 1937. All chemical data presented were furnished by Professor C. Juday, director of the Biological Survey, to whom the author is also indebted for the use of the facilities of the station, and for many other courtesies. |
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