380 
BULLETIN OF BUREAU OF FISHERIES 
PERCENT A - COMPOSITE, LOCALITIES WITH GOOD FISH FAUNA 
OF CASES *09 STATIONS, 2,280 DETERMINATIONS 
PERCENT C. MISSISSIPPI, GOOD FISH FAUNA 
OF CASES 114 STATIONS, 477 DETERMINATIONS 
60 
B. ATLANTIC COAST STREAMS 
106 STATIONS, 165 DETERMINATIONS 
60 
40 - 
Figure 11. — Comparisons of pH values of various river units. 
D. MISSISSIPPI, MEDIUM, POOR, OR NO FISH FAUNA 
105 STATIONS, 334 DETERMINATIONS 
Composite and black graphs as explained under figure 6. 
E. MISSISSIPPI, IMPOUNDED WATER 
PERCENT 
OF CASES 
100 { — 
HASTINGS POOL f MINN.) 
12 STATIONS, 136 DETERMINATIONS 
80 - 
60 - 
<0 - 
20 
C 
G. MISSISSIPPI, IMPOUNDED WATER 
PERCENT LAKE PEPIN (M!NN.,WIS.J 
OF CASES 23 STATIONS, 260 DETERMINATIONS 
100 
60 - 
60 
40 - 
20 - 
0 
F. MISSISSIPPI, IMPOUNDED WATER 
LAKE DAVENPORT AND MOLINE POOL C IOWA ILL > 
H. MISSISSIPPI, IMPOUNDED WATER 
LAKE KEOKUK CIOWA ILL.) 
Figure 12.— Continuation of comparisons of pH values for various river units, stippled graph A figure 11, being the standard 
