356 THE ISOCHLORS OF NOVA SCOTIA. VICKERY. 



Breton, notably that at Whycocomagh. In the peninsula 

 the largest springs are at Antigonish, but there is a small 

 spring at Walton, Hants County, with a percentage of a 

 trifle over unity. At Salt Springs, Pictou County, there 

 is a spring yielding 5.9 per cent, of salt, and at Cheverie, 

 Hants County, deep borings through gypsum gave strong 

 brines. Also there is a brine spring at Springhill. These 

 isolated points, however, probably have very little effect 

 upon the normal chlorine lines as herein determined, though 

 an observation of Mr. Cole's states that salt is very often 

 found associated with gypsum, and this may contribute 

 in some measure to the rather wide areas between the normals 

 along the Annapolis Valley as compared with those along 

 the Atlantic Coast. 



With the introduction of chlorine by means of 

 sewage we have nothing to do in this paper, because 

 the estimations were made on water taken from sources 

 as far as possible from any probable animal polution. The 

 influence of the sea on the amount of chlorine normally 

 found is quite striking, as the results of the estimations 

 show. The observations show that at the sea coast the 

 chlorine content is high, w^iile as we travel inland there is a 

 gradual decrease in the amount of chlorine normally found, 

 this decrease being more. rapid travelling inland from the 

 Atlantic Coast than it is travelling inland from the Bay 

 of Fundy shores. 



Use of Isochlor Determinations. The judgment passed 

 by the chemical analyst upon waters which are to be used 

 for drinking purposes is based partlj'' upon the amount 

 of chlorine found in it, hence the object of determining iso- 

 chlors is to give the analyst information as to the amount 

 of chlorine normalh^ found in water of known purity taken 

 from the locality from which the sample under examination 

 was obtained. Any excess over this amount would probably 

 be due to influences other than that of minerals or of the 



