M. MARIE-DAVY, who is intrusted with the Meteorological Department at the Observatory, Paris, has communicated a Paper to the Academy of Sciences on the great storm of the 2nd and 3rd of December. He confirms the statement that it was owing to a cyclone coming from the north-western coast of Ireland, and now continuing its course across Russia. From the 27th of November, the appearance of the curves of equal pressure (curves resulting from a graphical representation upon paper of the state of the atmosphere), justified some doubts as to the continuance of fine weather along the French coast. This state of things, however, continued until the night of the 30th.

On the 1st inst. the meteorological map, constructed by means of observations taken at 8 P.M., and telegraphed to Paris from every part of the French coasts, clearly announced the arrival of the cyclone in Ireland; its centre was at about 60 leagues from the north-west coast of that island.

On the 2nd, at 8 A.M., its centre Was found in the neighbourhood of Shrewsbury, south of Liverpool, while the storm itself was raging at Paris at 1 P.M., barometer falling to 731 millimeters, or 28-8 in. English.

Shortly after, however, it rose again with as much rapidity as it had fallen. The tempest, therefore, which had been moving southwards, had been driven back towards the north.

On the 3rd the centre of the cyclone had gone back to England, and was in the neighbourhood of York. From that moment it resumed its natural course, moving eastwards; on the 4th. it was somewhere north of Copenhagen ; and on the 5th it left the Baltic between Libau and Koenigsberg.

The centre of the storm travelled at the rate of 10 leagues per hour. Now, as this is the usual rate of much weaker storms, there is reason to believe that their velocity is independent of their violence.

M. MARIE-DAVY, after a general review of the state of the barometer in Spain, the Bay of Biscay, England, and Ireland, says that, although this storm originated in the lower latitudes, other storms may be formed much nearer to our own; and that the knowledge of their point of departure must necessarily precede all attempts to explain the manner of their formation. The study of the theory of tempests is still in its infancy; but every step in advance which telegraphy may take on the Atlantic will tend to improve the theory, and render casualties at sea more and more easy to avoid.