214 



to the demonstrations of Poisson and Cauchy, and the assumed 

 generalization of Mr. Peacock, to which is added a new in- 

 vestigation, and remarks on the development and continuity 

 of functions;" which was referred to a Committee. 



Mr. Lea read a paper, entitled "Notice of the Oolitic forma- 

 tion in America, with descriptions of some of its organic re- 

 mains, by Isaac Lea;" which was referred to a Committee. 



A communication was read from Prof. Locke, of Cincinnati, 

 the objects of which are, " 1. To determine more accurately the 

 relation, magnetic dip and intensity at Cincinnati, and at Louis- 

 ville, Ky., by making observations as near together, in point 

 of time, as possible. 2. To determine the horary changes of 

 horizontal intensity at Cincinnati, and 3. To ascertain more 

 accurately the effect of changes of temperature on the needles 

 used by the author, and to deduce a constant coefficient for each 

 of them." The paper was referred to the same Committee to 

 whom Professor Locke's previous paper on the same subject 

 was referred, (proceedings of March 6, 1840.) 



Mr. Du Ponceau made a verbal communication on the sub- 

 ject of the silk culture in India. 



It appears from the sixth volume of the Transactions of the Agri- 

 cultural and Horticultural Society of India, Calcutta, 1839, which is 

 in the library of the Society, that the English are extending the cub 

 tore, of silk to the Deccan and the Western Coast of India, and have 

 an establishment for that purpose, under the direction of Signor 

 Mutti, an Italian gentleman, who resides at Bombay, and is styled 

 " Superintendent of the Silk Culture in the Deccan." Two letters 

 addressed by him to John Bell, Esq. Secretary of the Agricultural 

 Society of India, Mr. Du Ponceau considered to be worthy of the at- 

 tention of those who feel an interest in the promotion of the silk cul- 

 ture in this country. A treatise by that gentleman on the various 

 branches of the silk culture, is subjoined to, and published with, his 

 letters. The chapter or division concerning the art or method of 

 reeling or winding silk from the eocoons, Mr. Du Ponceau regards 

 as replete with valuable practical instruction. 



On this last subject, (the art of reeling,) the correspondent at Paris 

 of the National Intelligencer asserts, that an excellent Treatise has been 

 lately published, in that capital, by Mons. Ferrier, which has been re- 



