h 

 3 



m 

 13 



s 

 10.06 



4 



31 



18.76 



4 



35 



31.35 



5 



45 



15.46 



2 



32 



5.40 





4 



12.59 



38 



the Franklin Institute, p. 125, which gives the following values for 

 the variation of the local times of the several phases, for a small va- 

 riation of terrestrial latitude or longitude, as follows : — 



Beginning. Ring. End. 



Variation for + or north 1" terr. lat. = — 0.0397 — 0.0382 — 0.0343 



Do. + or east Is of terr. Ion. in time = + 1.2600+ 1.1400+0.9925 



The means of his results for the State House, giving to each obser- 

 vation its proper weight, in mean time of the State House, are, 



Beginning, 



Formation of ring, 



Rupture of ring, 



End, -.-. 



Duration of eclipse, 



Duration of ring, - 



Mr. Du Ponceau presented a communication, entitled "A 

 Vocabulary of the Language of the Valiente Indians, who in- 

 habit the State of Costa Rica, in Central America, by Col. D. 

 Juan Galindo, of Guatemala." Referred to the Historical and 

 Literary Committee. 



Mr. Nulty read a mathematical paper, entitled "New For- 

 mulas relative to Comets, by E. Nulty, of Philadelphia." Re- 

 ferred to Dr. Patterson, Mr. Walker, and Capt. Talcott. 



The subject of this paper was the component velocities of a comet, 

 observed at three consecutive and moderately small intervals of time. 

 In a preliminary notice of his subject and the means employed in its 

 ■ development, the author mentioned some advantages which he con- 

 ceived to be attached to his peculiar mode of investigation. He 

 alluded to different results already known, and, with several novel 

 and general formulas comprised in his paper, he announced two new 

 sets of expressions which he represented as being directly applicable 

 to the exceptive cases, in which particular observations render the 

 forms hitherto given, doubtful or indeterminate. He also noticed a 

 numerical application which he made of his formulas and of others con- 

 nected with the method of Laplace, to the data of the comet of 1803; 

 and he intimated that a comparison of the results obtained by him in 

 that and other instances, had led him to some remarks, which he in- 

 serted towards the close of his paper, from his opinion of their ana- 

 lytical and practical importance. 



