271 



Gaseous Ethereal Compound, resulting from the reaction of 

 Nascent Hyponitrous Acid on Alcohol," &c, reported in 

 favour of publication in the Transactions of the Society, and 

 the publication thereof was ordered accordingly. 



The Committee, consisting of Dr. Patterson, Prof. Henry, 

 and Mr. Walker, to whom was referred a letter, addressed by 

 Dr. John Locke to Prof. Bache, containing observations to de- 

 termine the Horizontal Magnetic Intensity and Dip, at Louis- 

 ville, Kentucky, and Cincinnati, Ohio, reported certain ex- 

 tracts for publication. 



After describing the apparatus used in these observations, Doctor 

 Locke states, in detail, the results of two series of observations, each 

 made with three horizontal needles, and concludes from the mean of 

 them, that the relative horizontal intensities at Louisville and Cincin- 

 nati, are as 1 to 0.9727. The dates of the observations were March 

 7th, 10th, 11th, and 14th, 1840, at about noon of each day. The 

 correction for temperature, in each of the three needles used, was ob- 

 tained by experiments which are fully described, and which gave 

 the following coefficients: — for needle No. 1, 0.000125, for No. 2, 

 0.000145, No. 3, 0.000058. 



The magnetic dip at Cincinnati, as determined by two series of 

 observations, each with two needles, in March, 1840, was 70° 25'. 5, 

 and by one series, in April, 70° 28'. 8, and the dip at Louisville, by 

 three series, at nearly the same date, in March, 69° 54'. 9. 



The relative total intensities thus deduced for a period corres- 

 ponding to March 10th, 1840, are, Cincinnati, 1.000, Louisville, 

 1.003. 



A communication was read from Mr. C. G. Forshey, of 

 Louisiana, entitled "An Account of the Great Mound near 

 Washington, Adams county, Mississippi," which was referred 

 to a committee. 



Mr. Du Ponceau presented to the Society a Manuscript by 

 the late Mr. Heckewelder, containing the names of various 

 trees, shrubs and plants, in the Lennape (Del.) language, which 

 was referred to the Historical and Literary Committee. 



Dr. Horner read a communication entitled " Note of the 

 Remains of the Mastodon, and some other extinct Animals col- 

 lected together in St. Louis, Missouri. By W. E. Horner, 



