INDEX OF SUBJECTS. 187 



II. SUBJECTS. 



Page. 



Annual address of the President 49, 126 



Annual Meeting of the Society 84, 174 



Anomalies of sound from fog-signals, recent investigations by the Light- 

 House Board 23 



Anomalies of sound signals 39 



Artesian wells on the great plains 101 



Audibility, relation of fog and snow storms to 38 



Auditing Committee appointed 84, 174 



report of 89, 181 



Barometric hypsometry 48 



Barometric observations produced by winds, errors of 91 



Beaver Tail fog-signals, November 16, 1880 24 



Binary arithmetic, experiments in 125 



Carre's ice machine 100 



Circle equally distant from four points, geometrical problem to determine a 88 



Climate, Quaternary, of the Great Basin 21 



Coins and medals of national historic interest exhibited 22 



Committee, general 14 



general, standing rules of 10 



standing 14 



fills vacancies 115 



Compass plant 106 



Constitution 6 



Credit of the United States, past, present, and prospective 102 



Eclipse, lunar, of June 11, 1881 90 



Electric energy, storage of 46 



Error from single causes of error, composition of 106 



Fallacy, curious, as to the theory of gravitation 85 



Fisheries of the world 117 



Fog, relation of, to audibility 38 



Fog-signals, anomalies of sound from 23 



Fog-signals, Beaver Tail 24 



Fog-signal tests at Little Gull Island, July 11 26 



Geometrical problem to determine a circle equally distant from four points . • 88 



Geometrical question relating to spheres 107 



Government securities, accrued interest on 21 



some formula; relating to 106 



Graphic table for computation 120-122 



Gravitation, a curious fallacy as to the theory of 85 



Great Basin, Quaternary climate of 21 



Great Plains, artesian wells on the 101 



