HYDROLOGY OF NEW YORK 



843 



Table No. 97 comprises the averages of the regular weekly sani- 

 tary analyses, as made for the Health Department of Rochester by 

 Fred R. Eilinger : 



Table No. 97. — Analyses of hemlock lake water foe 1902 

 (Parts per 100,000) 









49 







e3 



00 

 0> 



© 



00 







•OS 



•55 g 



2 <» 



o 



C8-P 





i 



o 



s 



1 



■~ 



1 







u 





, 133 



1 



11 





.a's 



a s 



Month 







ed res 

 low re 



© « 



eg 



1 

 5 



a 



d 



o 



A 



9 

 bO 



s- 



a 



9 

 U 



u 











O 



§ 



I 





+3 



+s 







EH 











Q 



»25 





(1) 





(2) 



(3) 



(4) 



(5) 



(6) 



(7) 



(8) 



(9) 







9.875 



6.375 



3.500 



0.0010 



0.0092 



0.2200 



Trace 



None 







9.500 



5.875 



3.625 



0.0010 



0.0081 



0.2200 







March 





9.500 



6.000 



3.500 



0.0010 



0.0087 



0.2175 



:: 





April 





9.125 



5.750 



3.375 



0.0010 



0.0087 



0.2200 







May 





9.125 



6.000 



3.125 



0.0010 



0.0091 



0.2225 







June 





9.875 



5.875 



4.000 



0.0010 



0.0091 



0.2275 







July 





10.666 



6.666 



4.000 



0.0010 



0.0091 



0.2200 







August 



September 





10.125 



6.437 



3.687 



0.0011 



0.0090 



0.2200 









9.750 



6.250 



3.500 



0.0010 



0.0090 



0.2150 











9.125 



5.375 



3.750 



0.0011 



0.0086 



0.2150 







November 





9.125 



6.125 



3.000 



0.0010 



0.0086 



0.2175 







December 





9.250 



5 . 875 



3.375 



0.0020 



0.0088 



0.2175 



u 





Average . . 



.1902 



9.586 



6.050 



3.536 



0.0011 



0.0088 



0.2177 







.1901 



9.833 



6.239 



3.594 



0.0010 



0.0089 



0.0221 







Hardness is not ordinarily determined because it does not vary 

 much, being nearly constant from year to year. The following by 

 Mr Eilinger shows the small variation: 



Total hardness, parts per 100,000 



December 7, 1895 6.70 



December 21, 1895 6 . 70 



January 18, 1896 6.20 



February 1, 1896 6.80 



April 10, 1897 6.20 



May 8, 1897 6.80 



July 9, 1898 7.30 



June 19, 1903 6.80 



June 10, 1904 6.70 



