210 



heights readied by the floods of previous years. He ascribed 

 the extra elevations, at certain points along the profile sec- 

 tion, to the obstruction which a narrowing of the water basin, 

 or a change in its direction, should produce. Instead of the 

 usual difference of 1.8 foot, between the levels of the surface 

 of the water, at the head and at the foot of Fairmount pool, 

 there occurred a difference of 20 feet, at the height of the 

 flood. Oscillations in the flood-level, averaging six minutes 

 in duration, were observed on the shores, and in the forebay, 

 near the dam, the greatest of which was about 18 inches in 

 vertical extent. The maximum velocity of the water was 

 about nine miles an hour where it passed over the dam. 



Height of Water above. 

 1823 Ice flood of Feb. 21 



Nominations for membership were read and balloted for. 



On motion, the New Bedford Public Library was ordered 

 to be placed on the list of correspondents to receive the Pro- 

 ceedings from the beginning. 



The ballot-boxes were then examined by the presiding ofli- 

 cer, and the following persons declared duly elected members 

 of the Society : 



Miss Maria Mitchell, of Vassar College, N. Y. 



Mrs. Mary Somerville, of England, now of Naples, 



Mrs. Elizabeth Agassiz, of Cambridge, Mass. 



Charles Darwin, of England. 



George Rawlinson, of England. 



Louis Gruner, Ecole des Mines, Paris. 



Carl Vogt, of Geneva. 



Carl T. E. Yon Siebold, of Munich. 



Carl Fr. Naumann, of Lcipsig. 



