OBSERVATIONS.
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OBSERVATIONS. ' 1*11 never, Nature, bid farewell T o thee. T h o u in m y brain shalt dwell, Till m i n d shall have outgrown its clay And left its garment to decay.' J. W . Douglas (Ent. Mag. 1838, 259). AURORA BOREALIS.—The Northern Lights were particularly strong on the night of 24 February last throughout all Britian, whence reports came in, plainly showing the peculiarly slow rate at which the visibility of the phenomenon travelled southward. T h e main feature consisted of a mighty arc traversing the whole sky, whence rose a great rufescent curtain of colour, which was visible for several hours in some districts. It was especially noted at Leuchars in Fife, Newcastle, north Wales ; Ross in Hereford, whence it took three hours to reach London ; Devon and in Suffolk. Its next apparition seems to have occurred on 14 October, but this was reported from no further south than the Shetlands.—Ed. OUR CLAY RIVER-WALLS.—Can any Member teil me at what approximate date the River-walls along the lower reaches of the Deben and Aide, and doubtless those of other rivers along our coast-line, were constructed ? I suppose the adjoining lands were flooded with brackish water (for most of these rivers are tidal up to a point), and that either the landowners or some public authority built the River-walls to reclaim these lowlying lands and to confine the rivers. Could you refer me to any book in which I might discover something of their origin ? I have looked pretty carefully through the Victoria History of Suffolk, but cannot find any reference to them there. It is a practical question which impels me to embark on this enquiry, as some doubt has arisen with regard to the Aide ; and, if I can be put in the way to arrive at the S o l u t i o n , I shall be extremely grateful.—ULLSWATER, Campsea Ashe High House; 15 Oct. [WE are satisfied that a definite reply will be forthcoming from some of our more practical Members, though the matter is distinctly Unnatural History. Such reclaimed lands are invariably timbered with fast-growing Willow and Osier, and never show Oaks or Elms of Over a century's growth. W hite's