INDEX OF SUBJECTS. 189 



Page. 



Storm-centres, retardation of, at elevated stations 10S 



Standard time, a system of 112-117 



Standing rules, constitution, list of officers and members 5 



for the government of the Philosophical Society of Wash- 

 ington '- 7 



of the General Committee 10 



Steiner's Power-Circle, some of the properties of 89 



Survivorships on 122 



Temperature, conditions determining 90, 91 



Teredo naval is, peculiar ravages of 98 



Thermometer, Siemen's deep-sea 100 



Treasurer of the society, annual report of 176, 180 



United States, credit of, past, present, and prospective 102 



Ventilation of the House of Representatives 99 



Washington, remarkable halo witnessed at 112 



Wind, errors of barometric observations, produced by 91 



Winter weather, on the prediction of 122-125 



