Intelligence atid Miscellaneous Articles, 457 



suance of this object, simultaneous observations were made during 

 twenty days of the month of June, 1835, at about 500 places, ex- 

 tending from Florida to Nova Scotia on one shore of the Atlantic, 

 and from Gibraltar to the North Cape of Norway on the other. At 

 the same time similar observations were made at the several coast 

 guard stations round the British Islands. The lecturer exhibited 

 maps on which cotidal lines, or lines of contemporaneous high water, 

 were laid down. These maps to a great extent verify the conclu- 

 sions at which we arrive by theory. The tide wave raised in the 

 southern ocean is propagated up the Atlantic northward ; it then 

 pursues its course round the northern coast of Scotland, and along 

 the eastern shores of England, till it finally arrives at the mouth of 

 the Thames. At the same time derivative tides are propagated 

 through St. George's and the British Channels ; so that these tides 

 meeting with those which arrive from the north of Ireland in the 

 one case, and the north of Scotland in the other, produce inter- 

 ferences of various degrees and forms. It appears from observation 

 that the tide coming up the British Channel turns off to the Dutch 

 side of the German Ocean, while the tide coming from the north- 

 ward is flowing on the coast of England in the opposite direction. 

 On the coast of Jutland it appears that the tides are almost en- 

 tirely obliterated by interference. 



A remarkable fact exhibited by the accurate tide observations of 

 1835, is the great retardation of the tidal wave produced by the 

 shores along which it is propagated. In some places the cotidal 

 line instead of being inclined to the coast at a considerable angle is 

 almost parallel to it ; and so it happens that while it is high water 

 at two promontories bounding a bay at a certain time, it will be 

 high water considerably later in the bay itself. Thus in the British 

 Channel the 10 o'clock cotidal line runs from the eastern shore of 

 the Isle of Wight, touching Beachy Head, Dungeness, the headlands 

 between Dover and Ramsgate, and extends into the mid-channel 

 off the North Foreland, while on the other side it is pretty nearly 

 parallel to the French coast, touching Cape Blanc Nez, and the pro- 

 montory of St. Valery westward of Dieppe. Hence, it is high water 

 at Brighton later than at Beachy Head, at Folkstone later than at 

 Dover, at Dieppe and Boulogne later than at Calais. The same 

 effect is exhibited in numerous instances as the tidal wave travels 

 northward along the coasts of America and Spain. 



At the end of the lecture the lecturer announced his intention of 

 taking the figure of the earth as the subject of his next course, which 

 will commence on the 4th day of next term. May 26. 



ON THE INFLUENCE OF HEAT, ETC ON THE CIRCULATION OF 

 THE CHARA. 



M. Dutrochet read a paper before the Royal Academy of Sciences 

 at Paris, on the circulation of the Chara ; giving an account of his 

 experiments, showing the influence of temperature and mechanical 

 irritation ; and the action of salts, acids, alkalis, narcotics and alcohol 

 upon the circulation of the Ghara flexilis. 



