30 Bulletin Wisconsin Natural History Society [Vol. 12, Nos. 1 & 2 
The Aquatic Association of Ridgeway Bog does not now con- 
tain all the species found in the corresponding association in Lake 
Saint Germain, but the absence of such forms as Ntjmphaea 
odorata, Scirpus lacustris, and Gavia immer, even were they once 
Fig. 8. The Bay in the Western End of Lake Saint Germain, 
Wisconsin. 
Here the aquatic vegetation is mostly submerged. Note the slow in- 
vasion of sedges and Iris versicolor on the sand beach. 
present in Ridgeway Lake, is not surprising when one considers 
the changes which have taken place in the bed and shore of the 
lake, for it must be borne in mind that the lake proper, and con- 
sequently the Aquatic Association, is now nearing its last stages 
of obliteration. The small size of the lake and the shallowness 
of the water in it, and the lack of food and suitable breeding 
