THE accompanying photograph (Fig. 1) which was taken by me on Aug. 18 last at Knaith, five miles above Gainsborough, conveys an idea of the appearance of the tidal bore in the River Trent. Gainsborough is the most convenient stopping place for the visitor who desires to witness one of the most striking phenomena in the natural scenery of Great Britain. It is a sight which never palls, and at each high spring tide a group of residents gather on the bank at Gainsborough and at every village for twelve miles down the river. Visitors from distant parts of the country are, however, scarce, and this, I think, is largely owing to want of guidance as to dates when the display can be reckoned on with certainty.