PROCEEDINGS 



OF 



THE ROYAL SOCIETY. 



1840. No. 43. 



April 2, 1840. 



The MARQUIS of NORTHAMPTON, President, in the Chair. 



His Grace the Duke of Richmond and John Gwyn Jefferys, Esq., 

 were balloted for, and duly elected into the Society. 



The following papers were read, viz. : 



" Additional note to the Eleventh Series of Researches on the 

 Tides." By the Rev. William Whewell, B.D., F.R.S., &c. 



As an appendix to his former memoir on tide observations, the 

 author gives in the present paper the results of observations made 

 at Petropaulofsk, in the bay of Avatcha, in Kamtchatka, lat. 53° 1' 

 N., long. 158° 44' E., by the officers and men of the Seuivine, 

 commanded by the present Russian Admiral Liitke ; and which 

 were conducted v^dth great care and perseverance. The height of 

 the surface was noted every ten minutes, both day and night, and 

 when near its maximum every two minutes. 



It appears from these observations that the high water is affected 

 in its time by a very large diurnal inequality, reaching the enormous 

 amount of above four hours ; while its height is only slightly 

 affected by an inequality of that kind ; the greatest alternate ine- 

 qualities of height were something more than a foot. In the low 

 waters, there appears a much smaller inequality in the times, seldom 

 amounting to more than one hour ; but with regard to height, the 

 diurnal inequality is much larger than that for high water, reaching 

 to three, or even four feet ; and this in a tide of which the whole 

 rise, from the lowest to the highest, rarely exceeds five feet. The 

 theory of these phenomena is then discussed. 



The results of another series of observations made in July 1827, 

 at the port of Novo- Arkhangelsk, in the island of Sitkhoe, in Nor- 

 folk Sound (lat. 57° 2' N., long. 135° 18' W.), are also given, and 

 their theory considered. 



A paper was also in part read, entitled, *' On the Nervous 

 System." By Sir Charles Bell, F.R.S. 



