28 
Summarized, the figures are as follows : 
Table No. 4. — Showing racial prevalence in relation to season. 
Case rate 
per 1,000 
of popula- 
tion. 
Ratio of 
colored to 
white 
cases. 
Ratio of 
colored to 
white pop- 
ulation. 
1908. 
Cool months — January, February, March, April, May, October, 
November, December: 
White 
1. 46 
1 
Colored 
.97 
j 1 to 3. 7 
Warm months — June, July, August, September: 
1 1 to 2. 4 
AVhite 
1. 32 
1 
1.71 
I 1 to 1. 9 
1907. 
Cool months— January, February, March, April, May, June, No- 
vember, December: 
White 
1. 20 
1 
.60 
[ 1 to 4. 8 
Warm months— J uIjl August, September, October: 
1 to 2. 4 
White 
1.94 
1 
Colored 
1. 61 
[ 1 to 2. 9 
1906. 
Cool months — January, February, March, April, May, October, 
November, December: 
White 
1.45 
1 
Colored 
1.14 
1 1 to 3 
Warm months — June, July, August, September: 
1 to 2. 4 
White 
1. 98 
1 
Colored 
2. 32 
1 1 to 2 
1905. 
Cool months— January, February, March, April, May, October, 
November, December: 
White 
1. 29 
Colored 
1.07 
[ 1 to 2. 8 
Warm months — June, July, August, September: 
■ 1 to 2. 3 
White 
2.20 
I 
Colored 
2. 05 
[ 1 to 2. 5 
1904. 
Cool months— January, February, March, April, May, October, 
November, December: 
White 
1. 47 
1 
Colored 
1.02 
1 1 to 3. 3 
Warm months— June, July, August, September: 
1 to 2. 3 
White I 
Colored i 
1.82 
1. 84 
1 1 to 2. 3 
! 
These figures show that during the cool season typhoid fever in the 
District of Columbia is relatively more prevalent among the whites 
and that this relatively higher prevalence among the whites has been 
more marked during the past two years (1907 and 1908). 
