It must be remembered that before the canalizing of the Thames the influence of the tide was perceptible at least as high as Staines, where was also a crossing-place of immemorial antiquity.
"Early Britain--Roman Britain"
Edward Conybeare
The vision of a living being is an effective vision, limited to objects on which the being can act: it is a vision that is canalized, and the visual apparatus simply symbolizes the work of canalizing.
"Creative Evolution"
Henri Bergson