The Historic Thames
There are many other proofs remaining of the chief function which the Thames fulfilled in the early part of our history as a means of communication.
We shall see later in these pages how united all that line of the stream has been; how the great monasteries founded upon the Thames were supported by possessions stretched all along the valleys; how much of it, and what important parts, were held by the Crown; and how strong was the architectural influence of towns upon one another up and down the water, as also how the place names upon the banks are everywhere drawn from the river; but before dealing with these it is best to establish the main portions into which the Thames falls and to see what would naturally be their limits.
It may be said, generally, that every river which is tidal, and whose stream is so slow as to be easily navigable in either direction, divides itself naturally, when one is regarding it as a means of communication, into three main divisions.
There will firs