368 THE ISOCHLORS OF NOVA SCOTIA. VICKERY. 



herewith shows that high normal chlorine does not occur as 

 close to the sea coast in those States as is the case in Nova 

 Scotia. The Cape Cod Peninsula, as might be expected, 

 shows rather high observations, ranging from ten to twenty- 

 five parts per milUon, and these values are comparable to 

 those found in the vicinity of Yarmouth, Nova Scotia, which 

 is also more or less surrounded with salt water. These maps, 

 which are based upon an enormous number of observations 

 throughout the States, are necessarily much more complete 

 than that of Xova Scotia. 



It will be noticed that no observations from the extreme 

 eastern part of the Province have been included. This is 

 owing to the difficulties and expense involved of personally 

 obtaining samples in Cape Breton. No samples were collected 

 in northern Colchester and Cumberland County for the 

 same reason. 



One other line along which the research was prosecuted 

 deserves notice. In the paper of the U. S. Geological Survey 

 already cited, tables are included giving monthly observa- 

 tions of numerous sources. An attempt to verify the result 

 noted there was made in a very small way. Monthly obser- 

 vations were taken from two brooks with the object of dis- 

 covering any great seasonal variation. Only one of the two, 

 as will be noted from the appended table, is very satisfactory; 

 this shows a fair degree of constancy over the time that the 

 observations extended, that is to say, the seasonal variation 

 is ver}' slight. 



In conclusion, I have to thank the kind offices of many 

 friends who made it possible for me to collect samples in 

 what would have been, without their help, inaccessible 

 places, and also for information regarding the location and 

 sources of streams. In particular, I have to thank Dr. Mac- 

 kay of Dalhousie University for not only proposing the 

 work, but for collecting samples which made it possible 

 to draw the isochlors over the eastern part of the Province. 



