520 INDEX. 



Page 



Electrical researches of Henry at Princeton 238,494 



Electrical self-induction in a long wire discovered by Henry 237,239,394,447,493 



Electric Telegraph, Barlow's experiments on 59,83,223,485 



Electric Telegraph, Morse's experiments on 59, 382, 488 



Electro-magnet first made by Sturgeon 58,82,213 



Electro-magnet greatly developed by Henry 84,111,131,218,444 



Electro-magnet of intensity, first produced by Henry 223,227,488 



Electro-magnetic action developed by AmpSre 81, 213, 215, 477 



Electro-magnetic chronograph invented by Henry 155,272,398,448 



Electro-magnetic engine invented by Henry 143,230,445 



Electro-magnetic influence discovered by Romagnosi and Oersted 79,213 



Electro-magnetic telegraph first devised by Henry 85, 131, 149; 228, 380, 487 



Electro-magnetic telegraph first suggested by AmpSre 223 



Elevations, topographical, of the State of New York tabulated by Henry 270,444 



Engineering survey in New York State, by Henry 57, 183, 210, 428 



Engine operated by electro-magnetism, the first 143,230,445 



Eulogy by Henry, of A. Dallas Bache 330 



Europe, Henry's first visit to, in 1837 64,244 



Europe, Henry's second visit to, in 1870 307 



Exchanges of scientific publications, established by Henry 298 



Executive Committee of the Board of Regents, directed to make arrangements 



for a public commemoration 1, 28 



Expansion of iron by magnetization, experiments on 329 



Experiment by Henry on the static rectification of alcohol 328 



Experiments of Henry on the strength of building-stone 326 



"Extra current" in a long electric wire, discovered by Henry 237, 239, 394, 447, 493 



Faraday and Henry compared 504 



Faraday, employment by, of Henry's multiple-coil magnet 222,230,390 



Faraday, production of electro-magnetic rotation by 81,479 



Faraday's regard for Henry j. 64,506 



Field, Cyrus W., Telegrams to, from London companies, read at the Memorial 



Services 76 



Finances of the Smithsonian Institution, flourishing condition of 48 



Financial ability and accuracy of Henry ; 46,97 



Fine-arts, fine appreciation of, by Henry 191,333,437,471 



Fire at the Smithsonian Institution in 1865, loss of papers by 305,459 



Fluidity, experiments on, by Henry _ 423,498 



Fog-signaling instruments, experiments on, by Henry 310 



Fog-signals greatly improved by Henry 311,464,499 



Forces of nature as motive powers, classified by Henry 273 



Forecasts of the weather inaugurated by Henry 287, 463 



Four elements of the ancients, typical of the fourfold state of matter 266 



Fourfold state of matter postulated 266 



Franklin and Henry compared 407,408,438 



Franklin's successor in Henry 70,83,93,170,444 



Fresnel, Augustin, experiments by, in 1820, to obtain magneto-electricity 233 



Fresnel, L. (secretary of the Light-House Board of France),- -testimony of, to 



the activity of the United States Light-House Board 308 



Funds of the Smithsonian Institution, flourishing condition of 48 



Funeral of Joseph Henry 11 



Funeral Sermon by Rev. Samuel 8. Mitchell 15 



Funeral services at the New York Avenue Presbyterian Church of Washington. 12 



Gale, Dr. L. D., assistant to Professor Morse in his early experiments on the 



electric telegraph 59, 150 



Gale, Dr. L. D. letter from, to Henry, on the telegraph of Morse 388 



Gale, Dr. L. D. successful application by, of Henry's discoveries, to the tele- 

 graph of Morse 59, 150, 383, 488 



