358 INDEX. 



Strychnine, phenomena of death from, 181. 



Surface of least extent, 298. 



Symmetry, animal, foundation of, 323. 



Synapta coriacea, Agassiz, 269. 



System, decimal, of weights and measures, 244. 



Talitronus^ gen., Dana, 202. 



insculptus, D., 202. 

 Talitrus, gen., Latreille, 201. 



gracilis, D., 201. 



Novi-ZealandicB, D., 201. 



ornatus, D., 201. 

 Teeth, accumulations on, 183. 

 Telegraph, electric, recording of, 284. 

 Telegraph, fire, 299. 

 Tellurium, 2. 

 Tethys, 304. 



Theory of internal fire in heavenly bodies, 272. 

 Thermometrical scale, 237, 243. 

 Tiaropsis diademata, 149. 

 Tidal currents, 100. 

 Titanium, nitruret of, 253. 



Tornado in Middlesex County, theory of,-269, 284,285,289, 298, 301. 

 Tornado, near Providence, R. L, 101, 291. 



Treadwell, Professor. Report of committee on meteorological ob- 

 servations, 231. 

 Troglodytes gorilla, 164. 

 Turbine wheel, 240. 



U. 



Undina, gen., Dana, 10, 22. 



inornata, D., 22. 



simplex, D., 22. 



vulgaris, D., 22. 

 Urinary red sand, 196. 

 Uristes, gen., Dana, 209. 



gigas, D., 209. 



