652 



SUBJECT-INDEX. 



Oxalis: radial symmetry, II, 152; 

 foliar surface, II, 264. 



Oxen: comparison with sheep, I, 

 158, 160; cerebro-spinal system, I, 

 598. 



Oxidation (see Oxygen). 



Oxygen: properties, I, 3-5, 20, 22; 

 compounds, I, 6-7, 10-13, 22, 24-5; 

 a crystalloid, I, 21; combining 

 power and atomic weight, I, 33; 

 organic change from, I, 37; heat 

 generation, I, 46-9; phosphores- 

 cence, I, 49; nerve force depend- 

 ent on, I, 53; animal metabolism, 

 I, 72, 73; necessary to animal life, 

 I, 94-5, 577; activity and amount 

 inhaled, I, 214. 



Packard, A. S., on eyes of cave- 

 animals, I, 648-9, 693. 



Paget, Sir J., blood changes in 

 small-pox and scarlatina, I, 221, 

 701. 



Palaeontology: distribution in time, 

 I, 404-11, 412; special creation, I, 

 425; congruity with evolution hy- 

 pothesis, I, 485-9, 556; relations 

 of present to extinct species, II, 

 10-11; scarcity of remains, II, 

 34-5; secondary thickening in 

 plants, II, 56; Cope on osteology 

 of Permian Vertebrates, II, 225-6. 



Pangenesis, Darwin's theory of, I, 

 356, 357, 359, 360, 362, 372. 



Panmixia, Weismann's hypothesis 

 of: its relation to Romanes* " ces- 

 sation Of selection," I, 560; al- 

 leged selective process denied, I, 

 561-3, 667, 685; distribution of 



. tactual perceptiveness, I, 608; 

 rudimentary eyes of cava-fauna, 

 I, 612-3, 647; Romanes on pro- 

 cess, I, 649, 667; degeneration of 

 self-feeding instinct in Amazon- 

 ants, I, 660-2, 670; rudimentary 

 limbs of whale, I, 668-9, 685; a 

 pure speculation, I, 671; markings 

 on leg-bones of Punjabis, I, 689. 



Paramcecium: parasite infesting, I, 

 427; reproduction, II, 443, 452. 



Parasites: sexual dimorphism, I, 

 315; limits to distribution, I, 397; 

 special-creation and, I, 427-9, 438; 

 retrograde development, I, 457, 



II, 12; aphis and ant, I, 660-1, II, 

 403, 405; as an integrating 

 agency, II, 402-4; its comparative 

 recency, II, 404; nutrition and 

 genesis in vegetal, II, 486; in ani- 

 mal, II, 487-90, 493; " castration 

 parasitaire " in crustaceans, II, 

 493-6. 



Parasol Ants, origin of classes, I, 

 687-8. 



Parthenogenesis: occurrence, I, 

 274-5; alternating with gamo- 

 genesis, I, 289-91; Owen on, I, 

 592; laws of multiplication, II, 

 415; in articulate animals, II, 445. 



Pasteur, L., silk-worm diseases, I, 

 622-3. 



Peacock: theories of heredity and 

 structure of tail feather, I, 372-3, 

 695, II, 618-9. 



Pear, foreright shoots, I, 287. 



Peloria: in gloxinia, II, 166; phseno- 

 gams, II, 180. 



Penguin, dermal structure, II, 314. 



Pepsin, I, 69. 



Pericyclic fibres of monocotyledons, 

 II, 278. 



Peripatus capensis, protoplasmic 

 continuity, I, 629. 



Peri-visceral sac, function and dif- 

 ferentiation, I, 391. 



Perkin, W. H., I, vi. 



Persistence of force, corollaries 

 from: properties of compounds, 

 I, 3; organic transformation, I, 

 60; growth, I, 150; organic en- 

 ergy, I, 220; variation, I, 335; 

 genesis, heredity, and variation, 



I, 354-5; morphological summary, 



II, 235; vegetal tissue differentia- 

 tion, II, 245; physiological devel- 

 opment, II, 394. 



Petals: foliar homology, II, 43-6; 

 " adnate," II, 58. 



Petrels, Darwin on, I, 455. 



Phsenogams: production of sperma- 

 tozoids, I, 186; morphological 

 composition, II, 37-79; leaf tran- 

 sitions, II, 37-42; foliar homolo- 

 gies, II, 42-9; origin of type, II, 

 49-84; vertical growth, II, 56-64; 

 axillary buds, II, 66; cotyledon- 

 ous germination and endogenous 

 growth, II, 69-72; axial homolo- 



