510 Wisconsin Academy of Sciences, Arts, and Letters. 
Some species, occurring only in scattered patches, could not be 
dealt with in this way. Their occurrence is reserved for later 
discussion. 
The remaining bays were not so easily handled. The bulk of the 
growth is very dense, matted together, and mixed with large 
quantities of filamentous algae. Under such conditions, separa¬ 
tion of species is next to impossible, and the best that could be 
done was to estimate the percentage of the total weight of each 
species in each sample. Owing to the extremely varied character 
of the flora in these bays, it was not possible to designate stations 
having each a homogeneous nature, but samples were taken of all 
the different types of growth, and the relative amounts of these 
types were judged by eye. Using these estimates, the weight per 
square meter of the several species was calculated for this type 
of growth as a whole, and the total weights were obtained by mul¬ 
tiplying by the area of the three bays, measured as in the previous 
case. Collections were made only in the small bay in station 30. 
Lack of time prevented samples being obtained from the other 
two bays, and it was necessary for the purposes of calculation to 
assume that all three were of the same nature, as was suggested 
by their general appearance. 
Data for all of the shallow bays are shown in table 10. 
Cladophora 
Three types of growth of Cladophora were distinguished, the 
nature of which will be discussed later. From notes taken in the 
field, the distribution of these types was plotted on the map, and 
measurement was made of the area of each. The total weight 
found in each area was then calculated, as in the cases of other 
species, from samples of each type. These data are given in 
tables 11, 12, and 13. 
Discussion 
Species of Plants. A list of the plants of the lake is given in 
table 1. This is not to be understood as a complete list of the 
attached flora of the lake, since only those types are listed which 
were represented in the samples, and these did not include some 
of the rarer species or those found only in the inlets or in the 
marshes. 
Not all the species of Potamogeton were separated from each 
