OF ARTS AND SCIENCES. 161 



Mr. Bond communicated several papers from Major W. H. 

 Emory, of the Corps of United States Topographical Engi- 

 neers, and Chief Astronomer and Surveyor, on the part of the 

 United States, of the Mexican Boundary Commission. 



These papers consisted of, — 1. Astronomical Observations 

 made at the City of Panama, New Grenada. — 2. Results of 

 Observations for the Determination of the Latitude of the 

 Northwest Bastion of the Fortification of the City of Pana- 

 ma. The station occupied by Major Emory was found to be 

 situated 2".75 north, and 6".85 west, of the cathedral. The 

 places of the adopted stars were taken from the British As- 

 sociation Catalogue. The computations were made by Major 

 Emory and Professor James Nooney, one of his assistants. 

 The following are the resulting latitudes : — 



1849, April 10th, 8 57 11.03 7 pairs of stars. 



" 11th, 8 57 13.31 7 " " 



" " 12th, 8 57 13.19 4 " " 



" 24th, 8 57 14.85 A single pair of stars. 



« " 25th, 8 57 12.27 8 pairs of stars. 



3. Eclipses of Jupiter's First and Second Satellites. Observ- 

 ed by Major Emory and Lieutenant A. W. Whipple, United 

 States Topographical Engineers, at the Northeastern Bastion 

 of the Wall of the City of Panama, and Moon Culmina- 

 tions observed by Lieutenant Whipple. The result of these 

 observations gave for the longitude of the northwestern bas- 

 tion of the city wall, 5^- 17'"- 57^=79° 29' 24" west of 

 Greenwich. 



The fourth paper contains Observations of the Elements of 

 Terrestrial Magnetism at Chagres, Gorgona, and at the City 

 of Panama, made by Major Emory, assisted by Lieutenant 

 Whipple. The first station at Chagres was " near the centre 

 of the plateau, east from the village, and 94 feet east from 

 a ruin consisting of two rows of brick pillars, there being five 

 pillars in each row." Latitude 9° 20' north, longitude S^- 20"'- 

 5^- west. 



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