162 PROCEEDINGS OF THE AMERICAN ACADEMY 



The second station, at the city of Panama, '' was upon the 

 glacis, just beyond the ditch, about 300 feet outside the west- 

 ern gate of the city. Latitude 8° 57' 12" north, longitude 

 79° 29' 24". 5 west. 



The instrument made use of in these magnetic observa- 

 tions was a " Fox " magnetic circle, made by W. George, at 

 Falmouth, England, under the immediate inspection of Mr. 

 Fox, who determined its relative indications in regard to Fal- 

 mouth. It has likewise been compared on several occasions 

 with the instruments of the Cambridge Observatory, in 

 1844-45 by Colonel Graham and W. C. Bond, and in 1849 

 by Lieutenant Whipple and W. C. Bond. The observations 

 are given in detail. 



The fifth paper contains Meteorological Observations made 

 at Panama. 



The sixth gives the Longitude of Chagres, derived from Five 

 Chronometers, transported in the Steam-packet " Northerner," 

 leaving New York on the 1st of March, and arriving at Cha- 

 gres on the 13th. Major Emory gives as the resulting longi- 

 tude, by these five chronometers, (assuming the longitude of 

 Columbia College, at New York, to be 4'^- 56™- 00^-,) of the 

 house of Don Luis Parides, 5*^- 20™- 05^.4, and its latitude, as 

 determined by Espinar, 9° 10'. 



Professor Gray communicated a paper by Dr. J. Deane, of 

 Greenfield, on Fossil Footprints of the Valley of the Connecti- 

 cut, with drawings. 



Dr. H. J. Bigelow submitted a paper entitled Descriptions 

 of Certain Tumors, with Remarks upon the Character of Mor- 

 bid Growths, usually thus designated. 



Professor Agassiz gave an account of some discoveries he 

 had made in respect to the structure of the tracheae and the 

 circulation in insects. He also exhibited living specimens of 

 Astrangia Danm^ a living coral which he obtained by dredg- 

 ing on the southern coast of Massachusetts, ofi" Edgartown, as 

 well as drawings illustrating their development and structure ; 

 also the curious structure of the cells which form their sting- 

 ing apparatus. 



