I N D E X. 



XXXI 



Ova, in lower animals, i. 199-202 ; 

 in higher animals, i. 203-211. 



Owen, Prof., on cause of organiza- 

 tion, ii. 583 ; internal organizing 

 tendencies, ii. 591. 



Oxytricha, origin of, from Euglense, 

 ii. 462 ; from Chlorococcus vesi- 

 cles, ii. 467 ; metamorphosis of 

 Vorticella into, ii. 493 ; transform- 

 ation of, into Trichoda, ii. 496. 



Palseontological Record, interpreta- 

 tion of, ii, 620; imperfection of, 

 ii. 622. 



Pangenesis, Mr. Darwin's hypothesis 

 of, ii. 98, 603 ; previous use of 

 term by Dr. Gros, ii. 484; in 

 Tardigrades, ii. 549 ; peculiarities 

 of, in Tardigrades and Rotifers, 



. 55i. 



Panspermism, views of Spallanzani 

 and Bonnet on, i. 259 ; nature of 

 theories, ii. 267 ; untenability of 

 hypothesis of, ii. 305, 359, 367, 

 53. 



Paramecium, evolution of, from 

 pellicle, ii. 240-250; its conver- 

 sion into Nassula, ii. 251 ; trans- 

 formations of, ii. 496. 



Parasites, higher, ii. 309, 539 ; 

 lower, in blood of animals, ii. 

 324-337; in tissues of plants, ii. 

 317, 338-342; in tissues of ani- 

 mals, ii. 342-358; within eggs of, 

 ii. 366. 



Pasteur, M., on resistance to heat of 

 spores of fungi, i. 316; double 

 nature of results in experiments 



by, i- 34. 345 374. 3 8 45 vital 

 theory of fermentation, i. 404 ; 

 his explanation of experiments 

 with bent-neck flasks, ii. ii ; on 

 atmospheric germs, ii. 271-275, 

 286. 

 Peach, converted into Nectarine, ii. 



59 6 > 59 8 - 

 Peacock, black-shouldered, origin 



of, ii. 598. 

 Pbrine, nature of, ii. 352, cxxii. 



Pellicle, formation of, on organic 

 infusion, i. 266; composition of, 

 i. 277, ii. 193; formation of em- 

 bryonal areas in, ii. 198; remarks 

 concerning changes in, ii. 205 ; 

 series of changes in, leading to 

 evolution of Monads, ii. 215; 

 other changes in, leading to evo- 

 lution of Fungus-germs, ii. 231- 

 235 ; evolution of Ciliated Infu- 

 soria from, ii. 237-254; changes 

 in, throw light upon mode of ori- 

 gin of living matter, ii. 262 ; con- 

 ditions favourable to production 

 of Ciliated Infusoria, ii. 244, 299. 



Penicillium, evolution of, ii. 195 ; 

 conversion of milk-globules into, 

 ii. 310. 



Peranemata, origin of, from Euglenae, 

 ii. 459 ; from Rotifers, ii. 484 ; 

 conversion of, into Ciliated Infu- 

 soria, ii. 485. 



Peziza, Corda on formation of spores 

 in, i. 184. 



Philodinioe, mode of origin of, ii. 



54- 



Physcia, formation of spore in, i. 

 186. 



Physical Forces, convertibility of, i. 

 1 3 ; correlation of vital and, i. 

 16-49, 6>' action of, upon living 

 tissues, i. 98 ; influence of, on evo- 

 lution of organic compounds, ii. 38. 



Physiological units, ii. 23, 90, 98, 

 603, 



Phytoids, ii. 542, 553. 



Pineau, M., on formation of spore in 

 Physcia, i. 186; observations of 

 heterogenetic changes, i. 261 ; on 

 origin of Penicillium, ii. 195 ; of 

 Monads, ii. 196 ; of Vorticellse, 

 ii. 252, 471 ; of Enchelys, ii. 238 ; 

 metamorphoses of Vorticellce into 

 Oxytrichse, ii. 493. 



Plaesconia, origin of, from Chloro- 

 coccus vesicles, ii. 467. 



Plague, cxliii. 



Plants, functions of, related to those 

 of Animals, i. 129; M. Brong- 

 niart on development of, in past 



