6 



draw for amendment his paper, entitled, "Notions sur la 

 Langue des Sioux," was acceded to by the Society. 



In pursuance of a recommendation from the same committee, 

 it was ordered that the Rev. Mr. Heckc welder's memoir "On 

 the Names of Certain Trees, &c. in the Lennape Language," 

 be published in the Society's Transactions. 



Mr. Walker read a continuation of his paper, entitled "Re- 

 searches concerning the Periodical Meteors of August and No- 

 vember ;" which was referred to the committee having charge 

 of the former part of the paper. 



Mr. Lea presented a paper, entitled "New Fresh Water and 

 Land Shells;" which was read, and referred to a committee. 



Professor A. D. Bache presented a paper, entitled "Observa- 

 tions on the Storm of December 15th, 1839, by William Red- 

 field, A.M.;" which was read, and referred to a committee. 



Mr. Walker presented a letter from Professor Peirce, of 

 Cambridge, Mass., containing remarks on Mr. Erman's discus- 

 sion of the orbits of the periodical meteors, and an investiga- 

 tion of their perturbations; which was read, and referred to a 

 committee. 



Professor Bache read an extract from a letter of Major Sa- 

 bine, stating that the changes of magnetic declination, and of 

 horizontal force, would be observed on the term days, with 

 transportable magnetometers furnished by the British Associa- 

 tion, by Mr. Schomberg, at Demarara, in Guiana; this being 

 (he first magnetic station yet established in South America. 



Professor Bache also stated, that he had received from Mr. 

 Bond, abstracts of the term day observations of changes of mag- 

 netic declination at Cambridge, Mass., for the months of June, 

 July, August and September: also, that he had received from 

 Lieut. Gilliss, of the U. S. Navy, observations of declination 

 made at Washington, from the 5th to the 9th of January, in- 

 clusive, from 9 to 10 A. M. of Gottingen time at short inter- 

 vals, for comparison with similar observations at Philadelphia 

 and Toronto. These observations he proposes, when com- 

 pared with those at the Philadelphia Magnetic Observatory, to 

 communicate to the Society. 



Dr. Horner requested that a correction should be made in 

 his communication, "On the Dental System of the Mastodon," 



