(cases to population, 1,94 per 1,000), the ratio of colored to white 
being 1 to 2.9. 
The effect of changing the position of the months of June and 
October in the divisions of the year to brmg out the strikingly com- 
parable ratios for the two years is of especial interest when con- 
sidered in connection with the fact that in 1907 the beginning of the 
summer weather was delayed, June bemg quite a cool month for 
this section of the country. (See Chart No. 4.) 
The mean temperatures of June for the past five years were as 
follows : 
June, 1904 
June, 1905. 
June, 1906. 
June, 1907. 
June, 1908. 
76° F. 
71. 8° F. 
75. 2° F. 
65. 9° F. 
71. 8° F. 
Therefore, by having June and October fall in one division of the 
year for 1908 and in another for 1907 we have the two years divided 
into periods of much more nearly parallel temperature curves. 
It was evident that during the warm weather of 1908 and 1907 
the proportion of cases among the colored population was much 
higher than it was in the cool weather of those }^ears. 
In 1906 also the proportion among the colored in warm weather 
was higher, but not as strikmgl}^ so. Thus in Januaiy, February, 
March, April, May, June, November, and December there were 
reported 239 white cases and 92 colored cases, the ratio of colored to 
white being 1 to 2.4; while in July, August, September, and Octo- 
ber there were reported 537 white and 238 colored cases, the ratio 
of colored to white being 1 to 2.2. 
On dividing the year into periods to correspond in months with 
those given above for 1908, there were reported in 1906 during the 
cool season (January, February, March, April, May, October, Novem- 
ber, and December) 445 cases, of which 109 were colored (cases to 
population, 1.14 per 1,000) and 336 white (cases to population, 
1.45 per 1,000), the ratio of colored to white being 1 to 3. 
TThile in the warm season (June, July, August, and September) 
there were reported 681 cases, of which 221 were colored (cases to 
population, 2.32 per 1,000) and 460 white (cases to population, 1.98 
per 1,000), the ratio of colored to white being 1 to 2. 
In 1905 the ratio of colored to white cases for the first of the 
above periods was 1 to 2.8 and for the second period (June, July, 
August, and September) 1 to 2.5. 
In 1904 the ratio of colored to white cases for the cool season was 
1 to 3.3, and for the warm season (June, July, August, and Septem- 
ber) 1 to 2.3. 
