THE ISOC'HLORS OF NOVA SCOTIA. \l( KI.KV. 303 



of chlorine in reservoirs, lakes serving as town and city water 

 supply, ponds, etc. (See U. S. Geological Survey, "The 

 Normal Distribution of Chlorine", by Daniel W. Jack.son, 

 Water Supply and Irrigation Paper, No. 144.) 



A number of determinations of well water, even under 

 the most ideal conditions, showed that little confidence could 

 be placed in results obtained from them. 



Ideal conditions for normal chlorine content were con- 

 sidered to be a clear running brook, having its course through 

 woodland, where there was no probability of pollution by 

 cattle or sheep, and as far as possible from farms or dwellings. 

 A few samples taken from brooks running through cleared 

 land or pastures, with farms on all sides, were clearly polluted. 



Localities Investigated. 



A series of observations were made along lines running 

 from the sea coast as far inland as possible. In this way six 

 distinct series of samples were collected: — 



One. A series from Halifax, Rockingham, Bedford, and 

 Grand Lake to Truro. 



Two. A series from Margaret ville to Middleton, and 

 thence along the line of the Halifax and South Western to 

 New German}' and Bridgewater. 



Three. A series from . Yarmouth inland some thirty 

 miles to Kemptville. 



Four. A few observations in Musquodoboit Harbour 

 and the Musquodoboits. 



Five. A series taken from Pictou to Sherbrooke from 

 samples collected by Dr. Mackay. 



Six. A few samples in the extreme eastern end of the 

 Province, Antigonish, Port Mulgrave, etc. 



It will be noticed that these lines aie at right angles to 

 the sealjoard. The second and fifth series stretch across 

 the Province. 



