THE ISOCHLORS OF NOVA SCOTIA. VICKERY. 3G7 



pt)int it is about eleven miles from the seven normal. It 

 runs a few miles south of Windsor, and thence nearlj'- to the 

 head of Cobequid Bay, its distance from the seven normal 

 gradually increasing. Around the Southern shore .it appar- 

 ently runs from six to seven miles from the seven normal, 

 crossing the same railway at West Northfield, cutting across 

 Bedford Basin between Rockingham and Bedford, and appear- 

 ing somewhere south of Musquodoboit Harbor, at which 

 point it is only about two miles from the seven normal. It 

 turns north through Guysboro County and is well located 

 by several observations in eastern Pictou County, passes 

 north of New Glasgow and joins the branch passing just 

 north of Truro. 



The Four Normal. 



Conforming to the normals already drawn in the Western 

 part of the Province, the four normal apparently forms a 

 closed curve, crossing the Halifax and South Western Railway 

 just south of Springfield, and again south of New Germany; 

 crossing a part of the Province in which manj^ large lakes, 

 such as Lake Rossignol, are situated. Another Hmb of the 

 curve probably passes through Grand Lake, and also some- 

 where about ten miles east of Truro, and curves back just 

 south of Ferrona, uniting with the line passing north of 

 Middle Musquodoboit as the normal at Musquodoboit was 

 4.4. This indicates that the larger portion of Halifax County 

 lies between the four and five normal and only in a narrow 

 strip of country might chlorine contents of less than four 

 be expected. 



IsocHLOR Work in Other Places. 



Isochlor maps of the New England States and of New 

 York have been prepared and are given in the U. S. Geological 

 Survey paper, already cited. Those of Massachusetts and 

 Connecticut are given in "Examination of Water", by Dr. 

 W. P. Mason. A com.parison of these maps with that given 



