SUBJECT-INDEX. 



655 



and wood formation, II, 592-7. 

 (See also Multiplication, Mor- 

 phology, and Physiology.) 



Plasmodium, dissolution of, I, 185. 



Plato, iSa of, II, 530. 



Platyhclminthcs: transverse fission, 

 II, 101; segmented and non-seg- 

 mented types, II, 102, 107; sym- 

 metry, II, 195, 197; multiplication 

 and growth, II, 488-9. 



Plethora, fertility and, II, 480-4, 

 511. 



Plcitrococcaccce, unicellular form, II, 

 21, 134. 



Plcuronectidw: symmetry and loca- 

 tion of eyes, II, 205; outer tissue, 

 II, 387. 



Plumatclla: metagenesis, I, 277; 

 symmetry, II, 195. 



Podostcmacca;, undeveloped circula- 

 tory system, II, 274. 



Polar bodies, hypothesis concerning 

 extrusion of, I, 266-8. 



Polarity, organic, of physiological 

 units, I, 226, 315, 317, 332, 350-1, 

 701-6. 



Polyatomic compounds (see Chem- 

 istry). 



Polych&tw, anomalous development 

 in Myrianida, I, 361. 



Polycytharla, integration, II, 90, 

 124. 



Polygastrica, aggregation, I, 586. 



Polymerism: of compounds, I, 9, 11, 

 25; nerve tissue, II, 356. 



Polypori, symmetry aiid environ- 

 ment, II, 139. 



Polyps (see Ccelenterata). 



Polyzoa: size, I, 140; multiaxial de- 

 velopment, I, 165; structural in- 

 definiteuess, I, 173: functional dif- 

 ferentiation, I, 202; trochophoral 

 kinship, I, 447; integration, II, 

 93-4, 96, 124; symmetry, II, 194, 

 207; vascular system, II, 340; 

 gemmation, II, 444. 



Poor Laws, and natural selection, 

 II, 532. 



Population, A Theory of, I, 265, 577- 

 601, II, 411. 



Potato: simulated growth, I, 136; 

 vicarious function of tuber. I, 209, 

 II, 255: sub-species, I, 302; dye 

 absorption, II, 279. 



Preservation: fertility and self-, I, 

 581; II, 423, 430; nutrition, II, 

 493. 



" Progress; its Law and Cause," 

 theory of species differentiation, 



I, 568. 



Projectiles, factors In flight of, I, 



450-1. 

 Proteids: metabolic function, I, 67, 



68, 69, 72, 76; complexity of 



molecule, I, 122. 

 Protein: evolution, I, 23, 24; isomer- 



Ism, I, 700, 703, 704. 

 Proteus, degeneration of eye, I, 613. 

 Protodrilus, intestine segmentation, 



II, 125. 



Protophyta: internal movements, I, 

 56; limit of growth, I, 138; devel- 

 opment, I, 164; structure, I, 173, 

 181-3; self-mobility, I, 175; indi- 

 viduality, I, 245; multiplication, 

 I, 270, 276, 279, 581, 584-5, II, 

 439, 462; genesis and nutrition, I, 

 i95; unicellular, II, 21; central ag- 

 gregation, II, 24; symmetry, II, 

 134; tissues, II, 244, 249; primary 

 differentiation, II, 385; primordial 

 type, II, 398; symbiosis, II, 400. 



Protoplasm: self -increasing func- 

 tion of primordial, I, 63-4; plant 

 metabolism, I, 65-7; complexity, 

 1,122,253-5; differeutiatkm in sim- 

 ple organisms, I, 182-3; continuity 

 and inter-circulation, I, 190-2, 

 371, 629, II, 21, 620; " streaming," 



I, 253; structure, I, 253-5. (See 

 also Cell.) 



Protozoa: inorganic components, I, 

 17; locomotion, I, 58, 175, II, 14; 

 vital changes shown by, I, 94; 

 limitation of growth, I, 138; de- 

 velopment, I, 164; structure, I, 

 173, 181-3; incipient differentia- 

 tion, I, 198, 391, II, 299, 309; mul- 

 tiplication, I, 270, 276, 279, 280, 

 582,584; 11,442,451-2; genesis and 

 nutrition, I, 295; distribution, I, 

 396; parasites infesting, I, 427; 

 Weismann's hypothesis of immor- 

 tality, I, 637; " spontaneous gen- 

 eration," I, 697-701; non-nucle- 

 ated, II, 20; primary aggregate, 



II, 86-7, 124: progressing integra- 

 tion, II, 89-91, 124; symmetry, II, 



