Water Supply of Kingston, Ont. 119 
amount of chlorine is increased by the rain, but only slowly. 
There is a cesspool about 30 feet from the well, and it is 
very likely that the overflow from this, increased by the 
rainfall, finds its way along the surface of the rock and 
through the cracks into the well. In the most favourably 
situated wells on the outskirts of the city I have found from 
10 to 20 parts of chlorine to the million. This well was 
then probably pretty badly polluted even before the rainy 
season began. I doubt if the most careful cementing above 
the rock insures a clean well. The limestone itself offers 
many channels for the passage of the polluted water into 
the well. 
For the sake of comparison I insert here Mr. Pope’s 
report on an underground rivulet in Portsmouth, about two 
miles from Kingston. The samples were taken during the 
same period as those from the well :— 
“The water issues from a fault which it follows for a consider- 
able distance before emerging.’ The spring is situated on a hill 
and is distant from outhouses, refuse pools, &c.” 
Parts of 
Sample. chlorine per Weather. 
million. 
11 ence 14.6 Fine. Twodays after heavy rain 
Oe ie ae 14.6 Showery 
As Ce 14.6 Showery 
A saopo000 14.6 Fine 
5 cooouded a Heavy rain night before sample was taken 
@. sedddoos 15.0 Fine 
Uc ores 14.9 Heavy rain night before 
& oooa oboe 14.4 Fine 
ieee aaais 5 - 14.0 + Fine 
I@ sco6 0000 14.0 Fine 
Il sccepese 14.1 Fine 
NW cooouvcdo Mele Fine 
1183 Sianianae 14.7 Raining 
14 ........ 13.7 Heavy rain 
Meters 13.09 Fine 
IG coco onec 14.3 Fine 
17 .....-.. 13.9 Showery. Heavy rain night before 
1 A small surface rill disappears into a large crack in the rock about } mile 
above this.—W. L. G: 
