. Calcutta Journal of Natural History. 546 Proceedings of the British Association. was formerly discussed, Mr. Russell had attributed these anomalies to the great southern tide wave entering the Firth at a different period from the great northern tide wave, to which the periods of high and low water cn the east coast of Britain are principally due. But other explanations had also been suggested in quarters so high as to entitle them to great respect. For the purpose of settling this question, and, if possible, reducing these anomalous tides to some law, Mr. Russell had recently instituted seco
. Calcutta Journal of Natural History. 546 Proceedings of the British Association. was formerly discussed, Mr. Russell had attributed these anomalies to the great southern tide wave entering the Firth at a different period from the great northern tide wave, to which the periods of high and low water cn the east coast of Britain are principally due. But other explanations had also been suggested in quarters so high as to entitle them to great respect. For the purpose of settling this question, and, if possible, reducing these anomalous tides to some law, Mr. Russell had recently instituted second series of observations on the tides of the Firth of Forth, conducted under very careful observers, the height of the tide being observed simultaneously by different observers, at the different stations, who recorded their observations every five minutes, and con- tinued them unceasingly night and day. They had only as yet extend- ed over a few weeks, but already there had come out of them results of a decided character, so as to set at rest the question of the origin of these tides, and to illustrate some curious points in the history of li- teral tides. The tides already observed had, he thought, proved the accuracy of the theory he had formerly advanced on this subject. But it would still be desirable that these observations should be continued and extended. He then proceeded to exhibit the results of the obser- vations in a series of accurate diagrams of the tides :— This diagram represents the two successive tides of a day, as usually observed on the coast of Britain. The line Ax, being on the level of a given low water, is divided into equal portions, representing hours, mi- nutes, &c, and lines perpendicular to Ax, namely, xy, XY, xy, propor- tioned to the successive heights, so that Hj is high water in the morning, H2 is high water in the evening, Lj and L2 being the suc- ceeding low waters. In this case the tides exhibit the usual form, and at the mouth of the
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