Memoirs of the Natioual Academy of Sciences, Vul. VII 



BELMONT DISTRICT. Laboratory of hygiene. 



LOWER SCHUYLKILL. 24th, 2rTH and 34th Wards. 



Diagram III. 



OCTOBER 



NOVEMBER 



DECEMBER 



JANUARY 



FEBRUARY | HARCH 



APRIL 



HAY 



JUNE 



JULY 



Rain Fall - inches 



0.4r5 



6.640 



i.srs 



2.380 



5.530 



2.900 



4.105 



5.360 



3.r50 



2.470 



Typhoid Fever 



11 Cases 



14 



10 



16 



22 



IT 



35 



21 



24 



22000 



BACTERIA 



In One 



Cubic 



Centimeter 



6000 



2000 



Parts per lOO Thousand 



Nitrogen 



a£ 



Nitrates 



0.06 



Free 

 Ammonia 



0.006 

 0.002 



Albuminoid 

 Ammonia 



OXYGEN 



Consumed 



0.15 



0.07 





0.020 



0.015 



0.008 



E 



dt 



a. 



n 



ml 



±± 



n 



u 



tn 



EH 



tn 



nmt 



n 



J ■ 



n 



