OF ARTS AND SCIENCES : OCTOBER 10, 1865. 31 



Memoire sur Quelques Faits relatifs h la Stridulation des Orthop- 

 teres et h leur distribution Geographique en Europe. Par M. Yer- 

 sin, Prof. 8vo pamph. Lausanne. 

 Giamhattista Dattino. 



Arringhe Officiose dell' Avocato Giarabattista Dattino gia Asses- 

 sore Demaniale della Provincia di Chieti Socio di diversi Accade- 

 mie. 8vo vol. Naples. 1863. 

 Prof. Giovanni Capellini. 



Studi Stratigrafici e Paleontologici sull' Infralias nelle Montagne 

 dell Golfo della Spezia, con due Tavole. 4to pamph. Bologna. 

 1862. 



Carta Geologica dei dintorni dell Golfo della Spezia e Val di 

 Masra Inferiore. Bologna. 1863. 



Five Hundred and fifty-sixth Meeting. 



October 10, 1865. — Adjourned Statute Meeting. 



The President in the chair. 



The President called the attention of the Academy to the 

 recent decease of Dr. Francis Wayland of Providence, of the 

 Associate Fellows ; also among the Foreign Honorary Mem- 

 bers, of Sir John William Lubbock, Sir William Rowan Ham- 

 ilton, the astronomer Encke, Admiral William H. Smyth, and 

 Admiral Lois Isidore Duperrey. 



Mr. John C. Lee was elected Treasurer of the Academy to 

 fill the vacancy left by the declination of Mr. Bowditch, who 

 was elected at the previous meeting. 



Mr. Ferrel presented the following paper : — 



On an Annual Variation in the Daily Mean Level of the 



Ocean, and its Cause. 



In discussing a large number of tidal observations, made at Brest,. 

 one of the results obtained is an annual variation of the mean level 

 of the ocean which cannot be explained by the hitherto recognized 

 changes of mean level. The mean height obtained for each month of 

 the year is given in the following table, in which each monthly mean 



