46 INDEX TO CONTRIBUTORS. 



PAGE 



15. Communicates a letter from General Lefroy. 



8T. On atmospheric electricity. 



90. Experiments on fog signals. [Lick. 



91. Communicates letters from Prof. Tyndall and Mr. J. 



93. Announces the death of Professor L. Agassiz. 



94. Communicates resolutions in memory of Prof Agassiz. 



95. Communicates a letter from Mr. B. Hallowell. 



91. A method of developing magnetism in bars of steel. 



98. Meteor trains, and the upper atmospheric currents. 



99. On Giffard'S injector. 



103. Remarks on the earthquakes of North Carolina. 



J. E. HlLGARD. 



21. The distance traversed on a loxodromic curve. 



22. Remarks on the geographical centre of the U. States. 



22. Remarks on a chronograph. 



23. Remarks on a chronoscope. 



29. The distribution of the population in the IT. States. 

 31. An exponential formula. 



35. The westward movement of the population of the U. S. 

 46 Remarks on auroras. 

 41, 48. The aurora of February 4th. 

 48. Auroral phenomena. 

 53. Hindoo arithmetic. 



53. The recording systems of the transatlantic cables. 

 65 Remarks on the new aneroid by Goldschmidt. 

 68. Proceedings of International Metrological Commission. 

 84. An inquiry into the laws of probability. 

 89. The air thermometer of Prof. Jolly. [wich. 



89. Determination of longitude between Paris and Green- 



90. Remarks in memory of G. C. Schaeffer. 



90. Experimental researches in acoustics by Prof. Mayer. 



92. Determination of personal errors in observations. 



]04. Introduces Hon. T. L. Clingman. 



104. Announces a new standing rule of the Society. 



105. Communicates a memoir by Prof. Alexander. 



106. Apparatus for investigation of error, 



T. HlLGARD. 



26. The number of the cephalic vertebrae. 



