308 
ep J 
40 
y 
Sj eA 
4 
7 
eA 
Se 
40 
20 
45 
8S =~ dW Ss 
~~ S 
¢ ~ Som eo 
Fics. 19 to 24.—Percentage by volume of six constituents of perch food. -o-0-0-, Lake Mendota, tors; 
1916; 
FUISMO AN IMS Fe FS 
BULLETIN OF THE BUREAU OF FISHERIES. 
(ye) 
Fig. /9, 
Chironomid Adults 
O” We 
7 Fig.€9. ES 
‘\ Gastropoda ,° 
\ x 
a 
i oN 
fig. 22. 
Ostracods 
fig. a9, 
Amphipods 
Fig. 24. 
oe 
a 
, Lake Wingra, 1916-17; , average. 
--+---, Lake Mendota 
