INDEX. 



533 



Nitrogen, circulation of, 123. 

 Nobili, 159. 



Nucleus of the cell, 856, 360. 

 Nuclei, theory of chemical, 103. 

 Nussbaum, 891, 402. 



Oceanography, 278. 



Odling, serial relations of elements, 



109. 

 CEcology, 289. 



Oersted, electro-magnetism, 158. 

 Ohm, law of electrical resistance, 



159, 160. 

 Oken, 335, 355, 376. 

 Olbers, 183, 186. 

 Olzevski, 95, 96. 

 Ontogeny, defined, 365. 

 Ontogeny and Phylogeny, 376. 

 Organs, balance of, 295 ; correlation 



of, 295 ; enigmatical, 291, 297 ; 



functions of, 290 ; rudimentary 



or vestigial 342 ; substitution 



of, 341. 

 Organic chemistry, development of, 



98. 

 Organism, different aspects, 283, 321 ; 



unity of, 288, 322; unsolved se- 

 cret of the, 320. 

 Osborn, 351, 421. 

 Ostwald, 79, 111, 114 ; measure of 



chemical affinity (1889), 130. 

 Ovum, 870. 

 Owen, Sir Richard, 337, 351, 402, 475. 



Palaeolithic, 480. 



Palaeontology, 344 ; evolutionary, 

 351. 



Palaeontological series, 850. 



PalaBospondylus, 851. 



Pallas, 183, 229. 



Palmieri, 74. 



Pancreas, 294, 296. 



Pander, 868, 378. 



Pangenesis, 402, 417. 



Parallax, 191. 



Parry, 262. 



Parthenogenesis, artificial, 873. 



Pasteur, 23, 29, 33, 67, 105, 266, 270, 

 864. 



Patten, sociological import of food, 

 513. 



Pearson, K., 899, 406; quoted, 134, 

 137 ; on scientific method, 24, 

 327 ; filial regression, 408 ; mul- 

 tiple inheritance, 409 ; statistical 

 study of inheritance, 408. 



Penck, 262, 264, 278. 



Periodic Law, 106, 110, 



Perkin, aniline dyes, 99. 



Perrey, Alexia, earthquakes, 254, 



Perthes, 278. 



Peschel, 278. 



Petrography, 270. 



Pettenkofer, 109, 300. 



Pflttger, 300, 391. 



Phagocytosis, 299. 



Fhenacodus, 350. 



Phillips, John, 288. 



Philips, W., 249. 



Phlogiston, 76. 



Photochemistry, 116, 



Photography, stellar, 201. 



Photometry, 202. 



Phylogeny, defined, 865. 



Physical basis of life, 316. 



Physics, definition of, 181 ; method 

 of, 131 ; arm of, 132. 



Physiology, history of, 283 ; com- 

 parative, 296; experimental, 299 ; 

 of tissues, 800 ; of cells, 813; of 

 protoplasm, 315. 



Physiological analysis, 287. 



Piazzi, discovered Ceres, 183. 



Pickering, 197, 200, 219. 



Pictet, 95, 96. 



Pithecanthropus erectus, 350, 476. 



Planck, 119. 



Planets, discovery of minor, 183. 



Plants, influence of, on the earth, 

 267. 



Play on animals, 459. 



Playfair, 226, 232, 241. 



Plutonists, 232. 



Pogson, 202. 



Poisson, 235. 



Pouillet, 159 ; on the sun's heat, 206. 



Poulett-Scrope, 257; on volcanoes, 

 252. 



Poulton, on age of the Earth, 246. 



Poynting, quoted, 131, 132, 166, 181 ; 

 on nature of matter, 175. 



Practical Mood, 3. 



Preform ation-theory, 366. 



Prenant, 298. 



Prepotency, 405, 440. 



Pr6vost, 253,357,369. 



Prichard, 400, 412, 4M. 



Priestley, 77. 



Pringsheim, 364. 



Proctor, 200. 



Progress in the organic world, 348. 



Progress of Science, its necessity, 46. 



Prophecy in science. 111. 



Proteids, 318. 



Protophytes, 364, 395. 



Protoplasm, 287, 315, 331 ; different 

 uses of the term, 816; physio- 

 logical conceptions of, 817. 



Protozoa, 364, 395; behaviour of, 458. 



Protyle or prothyle, 108, 113. 



Proust, 80, 98. 



Prout 88, 108, 118. 



