INDEX. 



533 



Nitrogen, circulation of, 123. 

 Nobili, 159. 



Nuclei, theory of chemical, 103. 

 Nucleus of the cell, 350, 360. 

 Nussbaum, 391, 402. 



O. 



Oceanography, 278. 



Odling, serial relations of elements, 



109. 



GScology, 289. 



Oersted, electro-magnetism, 158. 

 Ohm, law of electrical resistance, 



159, 160. 



Oken, 335, 355, 878. 

 Olbers, 183, 186. 

 Olszewski, 95, 96. 

 Ontogeny and Phylogeny, 376. 

 Ontogeny, delined, 365. 

 Organic chemistry, development of, 



93. 

 Organism, different aspects, 2S3, 321 ; 



unity of, 288, 322 ; unsolved secret 



of the, 320. 

 Organs, balance of, 295 ; correlation 



of, 295; enigmatical, 291, 297; 



functions of, 290 ; rudimentary 



or vestigial, 842 ; substitution of, 



341. 



Osborn, 351, 421. 

 Ostwald, 79, 111, 114; measure of 



chemical affinity (1889), 130. 

 Ovum, 370. 

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



P. 



Palaeolithic, 480. 

 Palseontological series, 350, 

 Palaeontology, 344 ; evolutionary, 



Paloeospondylus, 351. 



Pallas, 183, 229. 



Palmieri, 74. 



Pancreas, 294, 296. 



Pander, 368, 378. 



Pangenesis, 402, 417. 



Parallax, 191. 



Parthenogenesis, artificial. 373. 



Parry, 262. 



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



364. 

 Patten, sociological import of food, 



Pearson, K., 399, 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, Alexis, earthquakes, 254, 



Perthes, 278. 



Peschel, 278. 



Petrography, 270. 



Pettenkofer, 109, 300. 



PflUger, 300, 391. 



Phagocytosis, 299. 



Pheuacodus, 350. 



Philips, W., 249. 



Phillips, John, 233. 



Phlogiston, 76. 



Photochemistry, 116, 



Photography, stellar, 201. 



Photometry, 202. 



Phylogeny, defined, 3C5. 



Physical basis of life, 316. 



Physics, definition of, 131 ; method 

 of, 131 ; aim of, 132. 



Physiological analysis, 287. 



Physiology, history of, 283 ; com- 

 parative, 290; experimental, 299; 

 of tissues, 300; of cells, 313; of 

 protoplasm, 315. 



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, 



Play on animals, 459. 



Playfair, 226, 232, 241. 



Plutonists, 232. 



Pogson, 202. 



Poisson, 235. 



Pouillet, 159; on the sun's heat, 20. 



Poulett-Scrope, 257; on volcanoes, 



Poulton, on age of the Earth, 246. 



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

 on nature of matter, 175. 



Practical Mood, 3. 



Preformation-theory, 863. 



Prenant, 298. 



Prepotency, 405, 440. 



Prevost, 253,357,369. 



Prichard, 400, 412, 484. 



Priestley, 77. 



Pringsheim, 364. 



Proctor, 200. 



Progress in the organic world, 848. 



Progress of Science, its necessity, 46. 



Prophecy in science, 111. 



Proteids, 318. 



Protophytes, 364, 395. 



Protoplasm, 287, 315, 331 ; different 

 uses of the term, 316; physio- 

 logical conceptions of, 817. 



Protozoa, 364, 395; behaviour of, 458. 



Protyle or prothyle, 108, 113. 



Proust. 80, 98. 



Prout 88, 108, 113. 



