258 



Degli Ultimi Progressi della Geografia, del Cav. Conte Jacopo Gr&- 



berg de Hemso. 8vo. Milan, 1842. — From the same. 

 An Eulogium on William P. Dewees, M.D., &c. &c. By Hugh L. 



Hodge, M.D. 8vo. Philadelphia, 1842. — From the Author. 

 Grammaire Egyptienne, ou Principes Generaux de l'Ecriture Sacree 



Egyptienne, appliquee a la representation de la langue parlee. 



Par Champollion le Jeune, &c. &c. Folio. Paris, 1836. — From 



Professor John F. Frazer. 



Mr. Peale presented a copy of the letter dated 16th Decem- 

 ber, 1785, which accompanied the donation from his father, 

 Charles Willson Peale, to the Society, of the portrait of Dr. 

 Franklin, now in the Hall. The portrait is by Mr. C. W. 

 Peale, from the original by Martin. 



Prof. Henry D. Rogers submitted to the Society a brief ac- 

 count of the earthquake of the 4th of January of this year, 

 stating some general views at which he had arrived concerning 

 the direction and velocity of its transmission, and the nature of 

 the movement. 



By a reference to the facts in his possession, he showed that the 

 earthquake was felt from beyond the Mississippi to the coast of South 

 Carolina, and northward at least as far as Ohio and Indiana; and 

 that this fortunate remoteness of the localities, both in latitude and 

 longitude, tends essentially to promote the accuracy of the inferences 

 deduced. 



From a comparison of the observations at the different localities, 

 as contained in the best statements collected, he endeavoured to 

 show — 



First. That the areas simultaneously disturbed were linear, or of 

 the form of very elongated narrow belts. 



Secondly. That the earthquake was progressive, and moved from 

 west to east, the line of simultaneous disturbance shifting parallel to 

 itself. 



Thirdly. That it was thus propagated at the enormous velocity of 

 thirty miles per minute. 



Fourthly. That the facts of this earthquake lend decided counte- 

 nance to a theory of the origin and nature of earthquakes, presented 

 by himself and Prof. W. B. Rogers, in April last, to the Association 

 of American Geologists, which attributes the movement to an actual 

 billowy undulation on the surface of the liquid lava beneath the crust 



