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120 Canadian Record of Science. 
Mr. Pope concludes that the chlorine is affected very 
slightly by rains, but is somewhat decreased by heavy rains 
owing to dilution with pure water. I think we may take 
this spring as representing the unpolluted water of this 
district, as found in deep wells. 
In the spring and summer of 1891 I determined the 
chlorine in 45 wells, selected by Dr. Fee, our Health officer, 
as suspicious or obviously bad. <A few of these wells were 
not in use for drinking, but for various reasons had not been 
closed. The majority of them have since been condemned 
and filled up. Some of them were filthy beyond description, 
and were yet considered by those who used them to be 
excellent wells. In depth they varied from 10 ft. to 50 feet. 
They were scattered all over the city. I have here arranged 
them in order of purity (as determined by the chlorine 
test) :— 
No. Chlorine. No. Chlorine. 
Tal ape cee bar aed yee 15 DA oth oe ea ea 127 
PAS ea ARES Oe are: 17.8 D5) Sse atelsevie ene ee 128 
3 pains 5 onoonalgenoace 20 96) eh cass) eee 131 
AL ngagad 5090000000007 21 OH ETE Ae 5c 138 
een eaten 26 98) 2 Whos ios Does 142 
6 vere eeee cess eceees » 43 991s host eee 150 
PPGOSN OBER OnU 6G BOOGOD 44 BWisaciec bs odled te ee 
BS ceee cece cece eeeeees 45 Hess Seis als cole Reem 
ORs Te Mey EEA Ac, 49 BOF is. oo cee eee ee 168 
PAL) si eravel Sal eosteveras eeielevee 50 Dou Hele Ae 27 AES 174 
fiers tapes tele pieces che 55 BA tects tad sere 180 
“12 Senoop osqo oad anedd BOOM 285 0k a bee eee ecules 
1B eee cece ee ce eeee 64 PY OE no, FANE 
14 we eeee cece cece eee 73 7 Nien. | Oe a 210 
115) pee ce EN 5 Ue! BG. ny a eee 210 
16 cece eee seen cena 17 80) tics Ge aie eee 216 
Miatavehe calcio seiers oteveFereiel cles 77 A (ee eae Lt Salaleineee creme LO 
1S veceer eee e cece eeee 33 Al ce. cco eee . 223 
ND aevatcieisicokstelatiate isis leraie ters 84 7 a ESE 930 
20 vereee rere ceeeueees 94 Beh rae oe -22 eRe 
PN cionb GG b000 JODO GOGOC 94 BA irate teens ee . 328 
DD rae wears svete sm rele ats 97 ONES Nadiad ee 1760 
