CHARTS AND MAPS. 
Page. 
Chart No. 1 . — Showing cases according to onset of illness in 5-day periods, 1908, 
1907, and 1906 25 
No. 2. — Showing cases according to onset of illness, by days and by attrib- 
uted causation, 1908, 1907, and 1906 160 
No. 3. — Showing monthly death rate per 100,000 of population from 
typhoid fever in Washington, Baltimore, and Boston 25 
No. 4. — Showing relation of summer temperature to prevalence of ty- 
phoid fever in the District of Columbia, 1906, 1907, and 1908. 29 
No. 5. — Showing relative abundance of the fly {Musca domestica), by 
weeks, in the four quarters of Washington, D. C., from June 17 
to October 21, 1908 160 
No. 6. — Correlating prevalence of flies with reported cases of typhoid 
fever, by weeks 160 
No. 7. — Showing, by cmwes, abundance of flies in relation to the preva- 
lence of typhoid fever 30 
No. 8.— Showing typhoid fever death rate in Washington, D. C., Rich- 
mond, Va., and Baltimore, Md., from 1880 to 1909 41 
No. 9.— Showing number of cases, according to date of onset, among the 
customers of the principal milk dealers in Washington, 1908 . 102 
No, 10, — Showing percentage of 10 c, c, samples of water from the 
Altered water reservoir and various taps gi^dng fermentation 
in sugar broth 98 
Map No, 1,— Map of Washington, showing location of city blocks in which inten- 
sive study of typhoid fever was made, July 15 to October 24, 
1908 ■ 17 
No, 2, — Map of Washington, showing location of residences of cases of 
typhoid fever. May, 1908 32 
No, 3, — Map of Washington, showing location of residences of cases of 
typhoid fever, June, 1908 32 
No, 4, — Map of Washington, showing location of residences of cases of 
typhoid fever, July, 1908 32 
No, 5, — Map of Washington, showing location of residences of cases of 
typhoid fever, August, 1908 32 
No. 6. — Map of Washington, showing location of residences of cases of 
typhoid fever, September, 1908 32 
No. 7. — Map of Washington, showing location of residences of cases of 
typhoid fever, October, 1908 32 
No. 8. — Showing distribution of cases. May 1 to November 1, 1908, in "vital 
statistical areas 160 
No. 9. — Showing distribution of cases in the several water-ser\dce areas. 
May 1 to November 1, 1908 160 
No, 10, — Distribution of cases of typhoid fever which occurred from May 1 
to November 1, 1908, in the ^dtal statistical districts and in rela- 
tion to the city sewerage system 
(4) 
160 
