Memoirs of the Xatioual Academy of Sciem;es. Vol. VII. 



FRANKFORD DISTRICT. Delaware water. 



23rd, 25th, 35th and part of 19th and 33rd Wards. 



NOVEMBER 



DECEMBER 



JANUARY 



FEBRUARY 



HARCM 



APRIL 



HAY 



JUNE 



Diagram IV, 



JULY 



Rain Fall 



7.12 Inches 



1,63 



3,04 



5.78 



2.56 



4.96 



4.50 



3.62 



1.88 



Typlioid Fever 



19 Cases 



13 



24 



35 



36 



29 



44 



1.9 



23 



bacteria 



In One 



Cubic 



Centimeter 



10000 

 5000 



IC 



■ ■ - ■ 



I ■ I - 



JLl 



Nitrogen 



as 



Mliatcs 



0.06 

 0.03 



tit 



tt 



^ 



^ 



tt 



& 



rzt 



Parts per loo ThousanJ 

 0.012 



Free 

 Ammonia 



0,005 

 0,002 



l=t 



M 



B£ 



I ■ - I 



JLJ. 



I=t 



Alhuminiiid 

 Ammonia 



0.02U 

 0.015 



0.008 



It 



0.48 



OXYGEN 0.24 



Consumed 



0.12 



Clilorinc 



0.6 

 0.4 

 0.2 



l-m 



1— r 



n 



T=FI 



33 



