INDEX. 



485 



Owen, D. D., geology of Wisconsin, 



403. 



Oxychloride minerals, 442. 

 Oxygen, equivalent weight of, 176, 431 ; 



active, see Ozone. 



Ozone, relation of, to radiant heat, 46 ; a Plombieres, water of, 25, 205, 297 



triple molecule, 464; production of, 

 470; relation of, to nitrification, 471. 



PAI^EOTROCHIS, 411. 



Palaeozoic sediments, origin of, 10, 75. 



Palaeozoic formations of St. Lawrence 

 basin, 154; of North America and 

 England, thickness of, 50, 377; tabu- 

 lar view of lower, 386. See Cambrian 

 and Silurian. 



Palseozoic climate. See Climate. 



Palaeozoic ocean. See Ocean. 



Paradoxides Harlani, 405. 



Paragonite, 244. 



Paraffines of petroleum, 182. 



Paris, France, magnesian sediments of 

 296. 



Paris, Maine, granitic vein of, 195; 

 tourmalines of, 200, 212. 



Peat, 94, 181. 



Pebbles in veins, 204. 



Pennsylvania, geology of, 245; geologi 

 cal survey of, 420. 



Peristerite, 214. 



Perthite, 214, 444. 



Petalite, 210 ; formula of, 443. 



Petrolia, Ontario, waters of, 161. 



Plasticity of rocks, 4, 9, 44, 65, 72, 

 189-191. 



Playfair and Joule on equivalent vol- 

 umes, 434, 440, 457. 



Plication of rocks, 17, 55, 57, 72. 



Plutonic origin of stratified rocks, 186, 



294. 



Plutonic rocks, sedimentary origin of, 

 , 14, 43, 67, 317. See Exotic rocks. 

 Plutonists, 65 ; and neptunists, 45. 

 Point Levis, Quebec, geology of, 396, 



397. See Levis. 



Polybasic acids, their genesis, 464, 466. 

 Polymeric types, 464, 466 ; isomor- 

 phism. See Isomorphism, polymeric. 

 Polymerism in mineral species, 446, 



457. 

 Porosity of rocks, 103 ; determination 



of, 164; table of, 166. 

 Porphyry, quartziferous. See Ortho- 



phyre. 

 Potash, 21, 22 ; fixity of compounds of, 



12, 22, 95 ; how removed from ocean, 



22, 137, 144, 226; rare in ancient 



seas, 137; occurrence of, in natural 



waters, 126, 135-137. 

 Potsdam formation, 254, 260, 262, 266, 



268, 389, 403 ; Upper and Lower, 266 ; 



mineral waters from, 156. 

 Pratt on the solidity of the earth, 44. 

 Precipitation of sediments, influence of 



salts on, 10. 



Petroleum, 168; surface wells of in On- Predazzite, its relation to gypsum, 107, 

 tario, 171; of Chicago, 172-174; An-l 133. 



drews on, 174; of vegetable or of 

 animal origin, 179; hydrocarbon 

 gases accompanying, 182. 



Phillips, J. A., silicious deposits of Ne- 

 vada, 204. 



Phillips, John, on igneous rocks, 3, 24, 

 66; on rocks of Anglesea, 270; geol- 

 ogy of Malvern, 360, 370, 383. 



Phosphates in waters, 94-96, 142; con- 

 centration of, 225 ; relations to organ- 

 isms, 312. 



Phosphatic shells, 312. 



Phosphoric acids, genesis of, 466. 



Phosphorus, its diffusion in nature, 

 222. 



Plants. See Organic life. 



Pressure, its relations to fusion and so- 

 lution, 7, 39, 65, 66, 204. 



Primal rocks of Rogers, 255, 421. 



Primordial rocks of Barrande, 266, 368. 

 378. See Silurian, primordial. 



Progressive series in chemistry, 439. 



Protogine of Mont Blanc, 330. 



Protozoic rocks, 364. 



Pseudomorphism defined, 24, 286-294; 

 Dana on, 287, 291, 319, 320, 322; 

 Delesse on, 288, 292, 314-318; Nau- 

 mann on, 292, 322 ; Scheerer on, 291, 

 323; Warrington Smyth on, 313, 324; 

 illustrations of, 324-326. 



Pumpelly, R., orthophyres of Missouri, 

 250. 



