150 THE BRITISH ISLES. 



the close of the fourteenth century ; and the tide rises a foot liig-hcr tliun it did 

 forraerl}'.* 



Of the tributaries of the Thames, the Thame, Kennct, Wcy, Leu, Roding, and 

 Darent alone are navigable, for the MedAvay, which falls into its estuary, is, pro- 

 Fig. 82. — The Entrance to the Thames. 

 From an Aduiii-alty Chart. Scale 1 : 384,000. 



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perly speaking, an independent river ; and the same remark applies to the Chelmer, 

 Colne, and Stour, which fall into the mouth of the Thames, using that term in 

 its most extended sense, at various points on the Sussex coast. The Nore light- 

 ship, which lies off Sheerness, where the river is 6 miles wide, marks the 

 commonly reputed mouth of the Thames, but legally the Port of London is 



* Redman, Institution of Civil Engineers. 



