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which also fails in the anal- 

 ysis of the sea water, No. III. 

 On the other hand, in the 

 two deep waters, Nos. IV 

 and V, the calcium chloride 

 is again high. The magne- 

 sium chloride, the calcium 

 sulphate and the magnesium 

 sulphate are all similar to 

 the analysis of the sea water. 

 Obviously the bore hole 

 yielded a water which in its 

 entirety cannot be referred 

 to river or oceanic sources, 

 although it may have an 

 admixture of them. Its high 

 calcium chloride is like the 

 deep-seated waters of the 

 rocks, which if ever derived 

 from the surface, have un- 

 dergone notable changes in 

 chemical composition. 



In the earlier paper, Oc- 

 tober, 1908, the writer in 

 closing discussed the char- 

 acter of the lower Hudson 

 Yalley in the light of the 

 depth as there determined 

 for the bed-rock at Storm 

 King. The deepest record 

 was 608 - 6, but of course the 

 middle of the river was then 

 shrouded in mystery. It 

 was assumed further that 

 water was the sole eroding 

 agent. No good data were 

 available regarding bed-rock 

 conditions from Storm King 

 to the sea. The deep off- 

 shore channel of the Hud- 

 son had, however, been well 

 developed by sounding. 



Since then the data se- 

 cured by the engineers of 

 the Pennsylvania Railroad 

 in connection with the tubes 

 across the Hudson have been 

 made available. A row of 

 wash-borings has been put 



