19 
The same biological condition doubtless prevailed in the upper 
reaches of the pond. These, however, were visited during and just 
after a sharp freshet, and allowance had to be made therefor. About 
Cordova we found the same collecting of larvae in fine and leaf 
floatage which we found below: but we found it in fewer places, 
probably due to the freshet. In two live-water streams examined, 
one in the town of Cordova, a large number of larvae were found. 
Only a small number of larvae were saved from pond water here, 
and owing to accident, not enough of them hatched out to make a 
counting. Those from the stream in town were A. pimctipennis , 
and 150 were developed up to July 15. At Prescotts Creek bayou 
larvae were found attached to fine floatage and leaf floatage an¬ 
chored to limbs of trees, logs, etc., out in the bayou. Some of them 
were evidently washed out of the main creek by a heavy rain and 
flood; others, we believed, developed in situ. The basis for this 
belief was: (1) The presence of larvae of all sizes, and (2) their 
occurrence in places to which it would be impossible for larvae to 
wash. Schaudinn is quoted as saying that Anopheles larvae are 
not found in water over 1 meter deep. Here (and elsewhere) we 
found many of them in water over 6 feet deep. The water on this 
flat, however, was mainly shallow—from a few inches to 3 or 4 
feet deep. It covered many acres and the total breeding was large. 
Larvae were found only in floatage away from the banks; none was 
found next to the banks, which were gently sloping and free of 
floating shelter, although they had grass on them. At this place, 
up to July 9-14, much of the hatch was A. quadrimacvlaim. The 
water here (Prescotts Creek Bayou) was mainly shallow, still, and 
fairly exposed to the sun. Algae did not seem to be a factor in breed¬ 
ing anywhere in this pool at this time. 
SEPTEMBER AND OCTOBER SURVEYS. 
A survey was made close to the dam by Griffitts, September 17 to 
September 21, inclusive, simply to see if A. quadrima/ndcdus had 
appeared in the pool, as was the case on the Coosa. The pond was at 
its lowest, and the water clear at this time. Little floatage was found 
on the pond; the banks were clean, because the pond had been high 
and had stranded the floatage on the bank and then fallen. 1 Wher¬ 
ever there was floatage, larvae were found. Fish were much more 
abundant than in June. 2 There were very much fewer larvae in the 
1 Griffitts notes that most of the floatage observed at the surrey in June must have 
sunk, as from its location it could not have been washed away and less was stranded on 
the bank than was present in June. Leaf floatage, which comprised by far the bulk of 
what was seen here in June, stays afloat but a short time—days only. The same is true 
of pine needles. Fine floatage does not sink quickly, and bound together with algae, it 
may float a long time. 
2 One identified as Fundulus notatus was taken. 
