354 INDEX. 



Orchestia rectimanus, D., 203. 



scutigerula, D., 203. 



serrulata, D., 204. 



spinipalma, D., 203. 



sylvicola^ D., 202. 



tenuis, D., 202. 

 Orchestidse, fam., 201. 

 Orcula punctata, Agassiz, 269. 

 Organ, with perfect intonation, 226. 

 Ostracoda, 49. 

 Oxide of lead, solubility of, 93. 



Panama, latitude of, 161. 



PandarincB, Dana, 54, 58. * 



Pandarus, gen.. Leach, 59. 



Irevicaudus, D., 59. 

 concinnus, D., 59. 

 Satyrus, D., 59. 



Parsons, Usher. On a tornado near Providence, E,. I., 101. 



Peirce, Benjamin. Researches in analytical mechanics, 111. Re- 

 port on the results of the United States Coast Survey, 124. On 

 comets, 147, 235. On a new method of computing the constants of 

 the perturbative function of planetary motion, 197. On the turbine 

 wheel, 240. On the law of vegetable growth and the periods 

 of the planets, 241. On the masses of the planets, 250. On the 

 vis viva, 256. Theory of rolling friction, 256, 258. A case in the 

 theory of probabilities, 282. Classification of the Fellows of the 

 Academy, 285. Report on the Memoir of Lieutenant Davis on the 

 deterioration of Boston Harbor, 288. On the Middlesex tornado, 

 289. On the surface of least extent, 298. On Foucault's experi- 

 ment, 310. 



Peirson, a. L. On explosion of burning-fluid, 311. 



Pendulum experiment, 265, 268, 310. 



Penilia, gen., Dana, 47. 



avirostris, D., 47. 

 orientalis, D., 47. 



Penilidae, fam., 47. 



