792 



INDEX. 



Purier, Edmond, ' La Philosopliie Zool- 



o^que avant Darwin' quoted, ii. 309, 



322. 

 Periodic law of Mendeleeff, i. 315, 422. 

 Periodicals, scientific, the oldest, i. 41. 

 Permanence of formal rules, principle 



of, Hankel's, ii. 712. 

 Perrault, i^lan of co-operation proposed 



by, i. 99. 

 Perry, calculus for engineers, ii. 636. 

 Perthes, C. T., 'Politische Zustande 



und Personen in Deutschland zur Zeit 



der franzbsischen Herrschaft,' i. 133, 



256. 

 Perthes, Frederick, Memoirs of, i. 39, 



279. 



Pertz, first editor of ' Monumenta Ger- 

 manise,' i. 158. 



Peschel, 0. F., 'Geschichte der Erd- 

 kunde,' i. 291. 



Pestalozzi, i. 163, 253 ; his educational 

 influence in Germany, 257 ; began the 

 purely educational movement, 258 ; 

 inspired by Rousseau, 259. 



Peter the Great, i. 153. 



Petermann, geographical establishment 

 at Gotha, i. 167. 



Petit, i. 107. 



Petty, Sir William, statistics, i. 122 ; 

 (see Arundel) collection of relics, 295 ; 

 ' Political Arithmetic,' ii. 562 ; 564. 



PfefiFer, W., labours of, ii. 165 ; cellular 

 substances, 373. 



Pfleiderer, E., ' Philosophie des Heraklit 

 von Ephesus,' ii. 3. 



Pflliger, E., "proteid" theory, ii. 426; 

 " laws of reflex action," 519 ; on com- 

 pound organic molecule, 611. 



Phalaris, Epistles of, Bentley's con- 

 troversy about the, i. 169. 



" Philanthropinism " of Basedow, i. 166. 



Philip of Hesse, first Protestant uni- 

 versity founded by, i. 159. 



Phillips. See Combes. 



Philosophical faculty, development of, 

 in German universities, i. 164, 197. 



' Philosophical Magazine and Journal of 

 Sciences,' i. 41, ii. 48, 50, 55, 58, 69, 

 75, 85, 97, 109 ; on Carnot the elder, 

 139 ; 480. 



Philosophical theories, ii. 346 ; prob- 

 lems, 352, 743 ; thought, geographical 

 centre of, 750. 



Philosophy, definition of, i. 62, 65 ; 

 intermediate between science and 

 religion, 71, 73 ; and science, conflict 

 between, 205 ; and science, 311. 

 Phlogiston, i. 388, ii. 153. 

 Phonetics, ii. 539. 



"Phoronomie," ii. 5. 



Phrenology, ii. 476. 



Phylota.xy and phylogenesis, ii. 308. 



Physical and chemical reasoning con- 

 trasted, i. 424. 



Physical view of nature, ii. 95. 



"Physical" method, ii. 428. 



Physics and statistics, ii. 589. 



'Physik, Annalen der,' Gilbert's, i. 41. 



'Physik, Journal der,' Gren's, i. 41. 



' Physikalische Gesellschaft ' of Berlin, 

 i. 42. 



Physiocrats, so-called, referred to, i. 

 16 ; ii. 529. 



Physiological, units, ii. 272 ; division of 

 labour, 396 ; psychology, 512. 



Physiology pre - eminently a German 

 science, i. 216. 



' Physique, Journal de,' i. 41. 



' Physique, Observations sur la,' i. 41. 



Phjrtotomy, ii. 260. 



Piazzi discovers Ceres, i. 54, 82, 177, 

 182, 423. 



Picard, Ch. E., 'Traite d' Analyse,' ii. 

 690. 



Picard, Jean, calculations of, i. 97 ; as- 

 tronomical constants, 322 ; " methods 

 of dealing with astronomical errors of 

 observation," 324. 



Picavet, F., ' Les Ideologues,' i. 149, 

 152, ii. 470 ; quoted, 472. 



Pictet, condensation of permanent gases, 

 i. 316. 



Piderit, Ph. , mimicry and physiognomy, 

 ii. 477. 



Pinel, medical nomenclature of, i. 131. 



Pitcairn, medicine in alliance with 

 mechanics, i. 126. 



Plana, lunar theory, i. 329. 



Planck, Max, 'Das Princip der Erhal- 

 tung der Energie,' ii. 97, 99, 106, 

 197; 'Thermodynamik,' 142, 186; 

 159 ; labours of, 165 ; works of, 184. 



Planta, Martin, the forerunner of 

 Pestalozzi, i. 258. 



Platen, i. 213. 



Plato, constructive system of, i. 75 ; 

 views of Heraclitus, ii. 3 ; 4, 246 ; 

 archetypes, 259 ; his mathematics, 

 633. 



Playfair, John, scientific work of, i. 

 229 ; criticisms of, on science in 

 England, 231 ; review of Laplace's 

 ' Mecanique celeste ' quoted, 232 ; 

 biographical, ib. ; tribute to Colin 

 Maclaurin, ib. ; 234 ; quoted, 236 ; 

 270, 272 ; ' Huttonian Theory of the 

 Earth,' 283, ii. 292, 356 ; 579. 



PlUcker, Julius, geometry, i. 44 ; 187 ; 



