208 Royal Society. 



" Report of a Committee for collecting Information respecting the 

 occurrence of, and the more remarkable Phenomena connected with, 

 the Earthquakes lately felt in the Neighbourhood of Chichester." By 

 J. P. Gruggen, Esq. Communicated in a letter to P. M.Roget, M.D., 

 Sec. R.S. 



This paper contains an authentic report of several shocks of earth- 

 quakes which, during the last two years, have been felt at Chi- 

 chester and the surrounding country j drawn up from accounts given 

 by various correspondents, in answer to printed queries extensively 

 circulated. The first shock occurred on the 18th of September, and 

 the second on the 13th of November, 1833. Another and more se- 

 vere shock was felt on the 23d of January, 1834, and in the latter end 

 of the same year two slighter shocks were experienced, namely, one 

 on the 27th of August, and the next on the 21st of September; the 

 last, which was less than any of the former, took place on the 12th of 

 January, 1835. 



The Society adjourned over Whitsun week to meet again on the 

 18th instant. 



June 18. — The following papers were read : 



" Discussion of Tide-Observations made at Liverpool." By J. W. 

 Lubbock, Esq., V.P. and Treas. R.S. 



The author has here presented to the Society, by permission of the 

 British Association for the Advancement of Science f a discussion by 

 M. Dessiou of about 14,000 tide-observations made at Liverpool, on 

 the plan similar to that adopted with regard to the London Dock ob- 

 servations. The first book contains the moon's transits, classified 

 with the moon's parallax and declination, together with the date and 

 corresponding time and height of high water ; the height of the baro- 

 meter is also added to the observations of about four years. The 

 second book contains the same quantities, classified further according 

 to the different calendar months, and for each minute of the moon's 

 horizontal parallax. The third book contains a similar classification 

 for the moon's declination. The average results are given in tables 

 at the end. 



Some remarks are subjoined on the registers of the observations 

 taken at the London and St. Katherine's Docks; from which it appears 

 that the tide is about five minutes earlier in the former than in the 

 latter of these two places -, and that the difference in height is about 

 five feet. 



" On the Star-fish of the genus Comatula, demonstrative of the 

 Pentacrinus Europceus being the young of our indigenous Species." 

 By John V. Thompson, Esq., F.L.S., Deputy Inspector General of 

 Hospitals. Communicated by Sir James Macgrigor, Bart., F.R.S. 



The author states that the Pentacrinus Europceus, which is fixed by 

 its stem to other bodies, and consequently deprived of the power of 

 locomotion, is produced from the ova of the Comatula, and becomes 

 in a subsequent stage of its evolution detached, assuming the form of 

 this genus of Asterida, and capable of moving freely in the ocean ; at 

 one time crawling amongst submarine plants, at others floating to 

 and fro, or swimming in a manner similar to Medusa. 



