INDEX. 



Orizaba, Volcano of, Note 366. 

 Owyhee, see Hawaii. 



Oxygen, magnetic relations of, p. 50 and 91, and Note 75 ; quantity of, in rain 

 and spring water, Note 278. 



Pacific Ocean, volcanoes in and around the, p. 372386, 389, 411 ; arrangement of 



islands in the, Note 508 ; nomenclature of parts of the, Notes 507 and 533. 

 Papagayos, storms so called, p. 264-265, and Note 389. 

 Paramagnetism, p. 50. 

 Patricius (Bishop), hot springs near Carthage and theory of internal terrestrial 



heat, p. 197198, and Note 269. 



Pendulum experiments, p. 2431, 453484, Notes 14 and 1922. 

 Perote see Cofre de Perote. 

 Peru, volcanoes of, p. 276. 



Phlegra or Phlegraean fields, p. 260 ; the Astroni in, Note 589. 

 Picard, early inquiries on the figure of the earth, p. 25. 

 Pichincha, p. 239241. 

 Plana, on the density of the earth, p. 33. 

 Pompeii, causes and nature of the catastrophe, p. 409 and 444. 

 Popocatepetl, Note 603. 

 Pozzuoli, Note 555. 

 Pumice, in the Eifel, p. 234 ; Lipari, p. 319 ; Lactagunga, &c. p. 320323, 408 



410, 443447. 

 Pyriphlegethon, p. 34, 261. 



Quartz its presence near South American volcanoes, p. 424. 



Quetelet, p. 71. 



Quito, volcanoes of, p. 274276, 308. 



Ram, influence of, on the temperature of variable springs, p. 186. 



Reich, density of the earth, p. 31 and 32. 



Ribbed character of some volcanoes, p. 284. 



Richer, pendulum, p. 25. 



Riobamba earthquake, p. 167, 172. 



Rocky Mountains, p. 395 402, and Notes, 536549 ; tables of heights and vol- 

 canoes in the, p. 400402. 



Rose (Gustav.) chemical analyses and classification of volcanic minerals, p. 426 

 et seq., and Note 610. 



Ross (Sir James Clerk), magnetic observations, p. 77, 80, 108, 120, 148, and Notes, 

 88 and 97 ; Arctic voyages, p. 68, Antarctic voyage, p. 109, 370, and 411. 



Ruidos, p. 177-178. 



Sabine, magnetic observations, p. 68, 70, 71, 80, 109, 119, 129; magnetic discus- 

 sions, p. 72, 75, 76, 77, 7880, 81, 82, 85, 8790, 95102, 106107, 113 

 117, 132135, 139143, 147148, 451 and 485516 ; Notes, 80, 81, 120, 154, 165, 

 166, 175 ; pendulum experiments, p. 27 and 453 484. 



Sahama, p. 248. 



St. Helena, Island of, p. 330. 



St. Paul, Island of, p. 369370. 



St. Vincent, Volcano of, p. 177, and Notes 254 and 555. 



Santa Lucia, Volcano of the Island of, Note 555. 



Salses, p. 166, 206221. 



San Bruno, obelisks of, p. 171. 



