20 
pool than there were in June. The same two streams which were 
breeding in live water in June were still breeding profusely. From 
the larvae from these streams only A. punctipennis were developed; 
from those taken in the pond 35 per cent A. punctipennis and Go per 
cent A. quculrimacudatus were developed. It seems, then, that A. 
quadrimaculatus appeared in this pool later than A. punctipennis , 
just as on the Coosa. In certain houses examined 46 A. quadrimaau- 
latus were found in three residences, no A. punctipennis ; while in a 
vacant schoolhouse there were 6 A. punctipennis and 1 A. quadri¬ 
maculatus. 
An examination by Griffitts of a few bayous near Cordova. Octo¬ 
ber 13-15, showed the presence of A. quadrimaculatus in small pro¬ 
portion—about per cent— where none had been found earlier in the 
season. Only 58 imagos were developed, however, scarcely enough to 
base a percentage upon. There had been several frosts and it was 
cold, the water being 65° and 67° F. The September examination 
was not extensive enough to give data of much value in determining 
the amount of the production of the pool, nor was it intended for 
that purpose. The same is true of the visit to Cordova. It was too 
late to expect to find many A. quadrimaculatus larvae. 
MALARIAL FEVERS. 
There was a considerable amount of malarial fever in the general 
neighborhood of this pool, from Cordova to the dam on the west 
side of the river. It is reported as having been particularly severe 
opposite the fork of the river on the west side, and is thought by the 
writers to have been equally prevalent in the Prescott Creek neigh¬ 
borhood on the opposite side of the river. TVe were informed that 
there had always been some malaria in this country, but only a 
moderate amount. Xo systematic investigation of this matter was 
made, but there seems no question but that malarial fevers were 
unusually prevalent in the section named last summer and fall. The 
same was true in a great many sections of the South—it was a bad 
malarial year everywhere. 
Exactly how much of a factor this pool may have been in pro¬ 
ducing this condition in its neighborhood is not known. It is to be 
regretted that the biological examination of the pool and its environ¬ 
ments was not sufficient to determine this point, although it throws 
some light on it. In the few residences examined in which cases 
of fever had occurred 50 A . quadrimaculatus and 2 A. punctipennis 
were found. The two i. punctipennis were found on October 15th 
in cold weather with four A. quadrimaculatus in the same room. 
Larvae from a nearby breeding place developed 31 A. punctipennis , 
no A. quadrimaculatus. 
