MICROORGANISMS IN WATER 



315 



AVERAGE ANNUAL DEATH RATE FROM TYPHOID FEVER PER 100.000 OF THE POPULATION 

 1912 I 10 20 30 -40 SO 60 



MUNICH 



OUN 'AIM 



VIENNA 



BERLIN 



ZURICH 



HAMBURG 



PARIS 



LONDON 



CLEVELAND.O. 



PATERSON.NJ. 



WATERTOWN.N.Y. 



CINCINNATI^. 



SEATTLE.WASH. 



CH1CAGO,ILL. 



ST.LOUIS.HO. 



MINNEAPOUS.HINN. 



PHILADELPHIAJPA. 



PITTSBURGH. PA. 



NEW ORLEANS.LA. 



NEWYORK.N.Y. 



SPRINGFIELD.MASS. 



BINGHAMPTON,N.Y. 



ALBANY, NY. 



LAWRENCE.MASS. 



RICHMOND.VA. 



BALTIMORE.MD. 



HILWAUKEE,WIS. 



TOLEDO.O. 



ATLANTA. 



BIRHINGHAH.ALA. 



WHEEUNG.W.VA. 



MEMPHIS/TENN. 



ATLANTA,GA. 



SP 



LTEF 



EUROF 



UNG 



/ATERS 



CIT ES 



An instructive contrast between Altona and Hamburg before the latter filtered 

 its water, having learnt its lesson from a sharp outbreak of cholera. 



A FEW 



SCATTERED 



CASES OP CHOLERA. 

 ALTOHA 



HAMBURG. 



POPULATION: 600.000 

 CHOLERA CASES: 17.000 



- DEATHS: 8.60O 



ALTONA: 



HAMBURG: 

 W< 



WATER FILTERED 



!U 

 ATER UM FILTERED 



FIG. 122. (After G. E. Armstrong.) 



