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PROCEEDINGS OF THE [Sept., 1858. 



I shall take an early opportunity for giving you the required in- 

 formation concerning the paper on Thermo-Electricity. I would 

 also state that the fourth pait of the proceedings has not been re- 

 ceived, if published. 



With sentiments of the highest esteem, I remain, 



WILLIAM SHARSWOOD. 



July 24th, 1858. 



Prof. J. McCrady made some remarks on a genus of free 

 floating Sertularian, without radicles, found by him in 

 Charleston Harbor. 



SEPTEMBER 1st, 1858. 

 Vice President W. W. Smith in the chair. 



Prof. L. R. Gibbes presented an undescribed species of 

 Aplysia. 



Dr. E. Ravenel : Coleopterous Insect, undetermined. 

 Dr. E. Ravenel : Scorpion, Key West. 



Contributions to Library. 

 Proceedings of the Essex Institute, Vol. II. Part 1, 1856-57 

 Prof. Gibbes read a paper entitled " Notice of the Phe- 

 nomena attending the Shock of the Earthquake of Dec. 

 19, 1857.'' 



I desire to put on record in our proceedings the phenomena 

 attending the earthquake of 19th of December last, as observed by 

 myself in this city, or communicated by others. 



No distinct shock or blow was perceived by me, but the motion 

 consisted of a series of horizontal oscillations, increasing gradually 

 in distinctness, and then subsiding somewhat more rapidly. The 

 agitation lasted about six or eight seconds, as well as could be esti- 

 mated, at the rate of about four or five oscillations (or double 

 vibrations,) per second, and was distinctly manifested by the mo- 

 tion of the floor of the room, (five or six feet from the ground,) by 

 the motion of the chair in which I sat, and by the rattling of an 

 adjacent door. The agitation was perceived by all the adults in 



