CONTENTS. 
Introduction. 5 
Survey of ponds in Alabama. 6 
Pool of Lock No. 12, Coosa River._. 7 
June survey. 7 
Physical condition. 7 
Biological condition. 11 
Conclusions. 13 
August and September survey. 13 
Factors determining breeding. 14 
Species of Anopheles in fall. 15 
Malarial fevers. 16 
Recommendations. 16 
Black Warrior, Pool of Lock 17. 17 
June-July survey. 17 
Physical condition..=. 17 
Biological condition.1. 18 
September and October surveys. 19 
Malarial fevers. 20 
Anopheles in houses. 21 
Aquatic vegetation—survey of pond at Bay View. 22 
Survey in South Carolina (Parr Shoals and Stevens Creek). 25 
Physical conditions. 25 
Shelter for larvae and breeding in the ponds.. 26 
Silver-leaf grass. 28 
Hammocks in ponds..... N . 29 
Movement of larvae on ponds. 30 
Species of Anopheles—preferential breeding places..:. 32 
Anopheles in houses. 33 
Distance of flight of Anopheles quadrimaculatus. 33 
Recommendations. 34 
ILLUSTRATIONS. 
Fig. 1. Chart showing creek, bayou, and pond. 8 
2. Section of pool of Lock No. 12, Coosa River, below the Narrows. 9 
3. Section of pool of Lock No. 12, Coosa River, above the Narrows. 10 
( 3 ) 
