COXTE^TS. 
5 
Page. 
IX. Previous reports upon typhoid fever ix the District of Colum- 
bia 217 
X. A SANITARY survey OF THE DRAINAGE BASIN OF THE POTOMAC Rr'ER. 
By Joseph GDldberger 229 
Acknowledgments 231 
Drainage basin 231 
The Chesapeake and Ohio Canal 234 
Radroads - 235 
Population in Potomac diMinage basin 235 
Pollution of the Potomac River 236 
Prevalence of t^'phoid fever 249 
■ Sewerage 2-50 
Population of Potomac basin which contributes direct sewage 
pollution 251 
XI. Typhoid fever in Washington and its relation to the Potomac 
WATER SUPPLY 255 
Washington's water supply 
The Washington filters 
Methods used in making and recording bacteriological examina- 
tions of water 
SummaiN' of bacteriological examinations of raw and filtered waters . 
Dalecarlia reseix'oir 
Georgetown reseix oii- : 
Washington reser^’oir 
Filtered water reseixfior 
Summaix' of the bacteriological examination of tap water 
The bacteriological improvement caused by sedimentation and 
filtration 
The mud in the water pipes 
The bacteriological studies of Potomac water in pre^^.ous years 
Relation of tj*phoid fever to the Potomac water 
XII. Chemical examination of the water slt*ply of the District of 
C OLUMBLL - 
Introduction 
General scope of the chemical investigation 
Methods of analysis 
Other investigations of the water supply of the District of Columbia . 
Subjects of tables 
Interpretation of the results of analyses 
The Potomac water supply 
Purification of the Potomac water supply by subsidence and 
filtration 
The water of taps and hydrants 
Deep wells of the District of Columbia 
Shallow wells of the District of Columbia 
Table waters 
Ice 
Wells used by ice factories in the District of Columbia 
Miscellaneous water supplies 
The Government Hospital for the Insane 
The Soldiei-s’ Home 
Che\-y Chase 
Tables 1 to 27, gi^■ing the results of analyses and other data 
257 
2-59 
261 
262 
263 
263 
264 
264 
265 
267 
268 
268 
30 
275 
277 
278 
278 
280 
281 
282 
284 
285 
287 
289 
290 
293 
294 
296 
29? 
297 
299 
299 
301 
