29 
cines. This corroborates statements made by many observers of mos- 
quito life, that the malaria-carrying mosquitoes do not by choice breed 
in water found about the habitations of man. 
MALaAriA IN HERRIN 
In order to secure a monthly record of the number of cases of 
malaria in Herrin, the physicians were asked to record their cases on 
blanks furnished them for that purpose. The monthly summary of their 
reports is given in the following table. 
NUMBER OF CASES OF MALARIA IN HERRIN, 1920 
Physician Mar. | Apr.| May |June} July Aug. |Sept. Oct. | Nov.} Totals. 
W. R. Gardiner 0 0 0 0 . 0 0 1 0 1 
E. M. Sanders 0 0 0 =i 1 , 0 | 0 0 1 2 
G, C. Chamness 3 5 6 6 9 9 9 4 0 51 
D. S. Boles* 4 3 4 13 12 10 12 0 0 58 
Carl Baker 0 0 0 x20 a 0 0 0 0 
L. W. Brown and F.C. Murrah| 0 0 0 0 | 20 27 25 24 18 114 
J.S. Waldman OS | 2 Se ty 2 1 4 0 13 
R. E. Ransmeyer i) 2 ips 0 ; 1 1 0 2 8 
Motalssnscceses: 7 12 13 21 43 49 48 33 21 247 
*Dr. Boles’ practice was taken over on October 1, by Dr. R. L. Kane. 
It should be said, in connection with these malaria records, that 
diagnosis was very often made by symptoms of disease and not by the 
blood test, a lack which may cause some inaccuracies in the foregoing 
records. However, even if a physician does not make blood tests, his 
records are probably as accurate in one month as in another. 
RELATION BETWEEN MALARIA AND THE MALARIAL MosQuiToEs 
Since malaria can be transmitted to man only through the bite of 
certain species of Anopheles, there should be some correspondence be- 
tween the amount of malaria and the abundance of Anopheles in a given 
place. To bring out this relationship at Herrin, I have plotted the follow- 
ing curves, comparing the monthly totals of the number of cases of 
malaria reported by physicians with the monthly totals of numerical 
values taken from the Anopheline mosquito breeding-record. These 
curves clearly follow each other in a general way; and the fact that there 
were cases of malaria reported before any Anopheles were found is prob- 
