178 ROCHESTER ACADEMY OF SCIENCE. [June 23, 
‘TABLE GIVING AMOUNT OF CHLORINE IN WATERS FROM -SPRINGWATER, 
\ 
N.¥:; AND FROM HEMLOCK LAKE IN PARTS PER 100,000 
AND ALSO IN GRAINS PER U. S. GALLON. 
g sa | 8 | a] 
2 2S | 
oO S Or aol eee 
BY Sis eis |, ead ieee 
6 |sc : : > | Eo! jt iS 
Ke ers Designation of Water. Ss & | & Remarks. 
DE eaies || SS om a. 
= = | = <a hla |e ze 
5 a > o 7a = 
=} S| | fo} a _— 
ios ene lt Fes ah ge a= 
: : 1889 
AA |Whitlock Well - - = S. A. L. | 6.17] 3.59| For Professor 
BB |Densmore ‘* - : = cc 4.13, 2.41 Lattimore’s results 
_ | CC Morris & Grover Well - - ec 1.51, 0.88in Sodtwm Chlo- 
= | DD Hendershot oS - - sc 9-56) 5.57\7ide see Table, 
s EE |Mrs. R. K. Grover “¢ - : ee 0.40| 0.23)page 71. 
= | FF |Steven Norton ob : = cS 0.40) 0.23 
| GG | Doty GB ns : cs 2 eee - 
HH Snyder (hotel) cc - x. <e 16.10) 9.38 
we | 1889 
3 | (3) |Lime Kiln guli at Advent church} C. H. 0.35| 0.20] 
So | (TE) R bunt eS «« N. end of village ue 0.37] 0.22! 
2 (15) Hemlock lake, Inlet well — - Ze 0.36] 0.21 
~ | (16) City Mains, Paine Drug Co.’ as Ee 0.32} 0.19 
ne | 1889 ; 
a ‘Tyler Spring - | G.W.R. | 0.20] 0.12) Normal water 
= Another Spring on E. hill 2 ss 0.25| 0.150f the region. 
a ‘Stream above town to east : cs 0.20] 0.12)Mean =0.13. 
| | _ 1887 lap 
a Hemlock Jake - = = | S. A. L. | trace} trace 
s 1881 | 
2 2s ane - - - |A. R. Leeds} 0.19} 0.11 
= le eeeSoi: 29 
ce 02 - : - [See Ae Ll. a|Norzo| ord 
The fourth series of analyses, as presented in this table, serves to 
emphasize a fact to which attention was drawn by Mr. Rafter ina 
paper, “On the Micro-Organisms in Hemlock Lake Water” two years 
ago, namely, that clearly there is a gradual increasing contamination of 
Hemlock lake water. At that time only the biological side of the 
question was presented, but these recent chemical analyses enable us 
to present with equal clearness the chemical evidence substantiating 
the same view. 
Thus in 1877 the amount of chlorine present was so slight as to 
give a trace only, as determined by Professor Lattimore. In 1881, 
Professor Leeds found o.11 of a grain per U.S. gallon, while in 1889 
the amount of chlorine is found to be 0.18 grains per U. S. gallon by 
Professor Lattimore. At about the same time in 1889, Dr. Harrington 
