LIST OF CHARTS AND MAPS. 
Page 
Map No. 1. Map of 'Washington showing cases, month of May, 1906 45 
No. 2. Map of W^ashington showing cases, month of June, 1906 45 
No. 3. Map of Washington showing cases, month of July, 1906 45 
No. 4. Map of Washington showing cases, month of August, 1906 45 
No. 5. Map of Washington showing cases, month of September, 1906 45 
No. 6. Map of Washington showing cases, month of October, 1906 45 
No. 7. Map of Washington showing distribution of cases, June 1 to Novem- 
ber 1, 1906 361 
No. 8. Map of W^ashington showing relation of cases to wells and privies. . 361 
No. 9. Drainage basin of the Potomac River 253 
Chart No. 1. Showing cases according to onset of illness by days 58 
No. 2. Showing cases according to onset of illness by 5-day periods 58 
No. 3. Showing number of cases according to date of onset, among the 
customers of the principal milk dealers of W^ashington 85 
No. 4. Showing mortality curves by months, from 1875 to 1906, inclu- 
sive 361 
No. 5. Showing population of the District in relation to typhoid fever 
among the white and colored races 361 
No. 6. Showing death rate from typhoid fever, malaria, diarrheal dis- 
eases and typho-malarial fever, 1877 to 1906, inclusive 361 
No. 7. Death rate from typhoid fever, W^ashington, 1895 to 1905, com- 
pared with run-off, precipitation, and temperature 361 
Diagrams A and B. Showing conditions in certain ice factories 100 
Figures 1 to 4. Curves showing relation of precipitation, run-off, tempera- 
ture, etc., to typhoid 233 
Figure I. Turbidity and bacterial improvement 286 
II. Nitrites and the colon bacillus 286 
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