IXDEX 



539 



PAGE 



Organs of out-reach 438 



Origin of species 277 



Orthogenesis 2 Si, 507 



Outgo 91 



Outlook 509, 511 



Ovary 122, 162, 188 



OverspeciaHzation 282 



Oviducts 189, 215 



Ovule 8, 150 



Ovule case 8 



Ovum 112 



Palaeontology 246, 260, 492 



Palatine teeth 183 



Palpus 18 



Pancreas 186, 198, 443 



Pandorina 107 



Parallelis-n 287 



Paralysis 466 



Paranioecium .72,111,439,469 

 Parasite. . . .45. 5°. 252, 263, 356 



Parasitic protozoans 113 



Parasitism 396 



Parenchyma 12c, 132 



Parthenogenesis . . ^^c^., 306, 339 



Pasteur 93 



Pasteur's Solution 93 



Pastoral stage 496 



Pectinatella 335 



Penicillium 95 



Pennaria 359 



Pentstemon 253 



Perianth 11 



Peristome 78 



Peritoneum 174 



Perla 244 



Persistence of the un- 



specialized 250 



Petals 7-9 



Phagocytes 350 



Pharynx 165, 183, 197 



Philodina 378, 379 



Phloem 134, 145 



Phlox 26 



Phylloxera 362 



Phylogenetic adaptation . . 415 



Phylogeny 236, 255 



Phylum 236 



Physical basis of racial soli- 

 darity 320 



PAGS 



Physcia 393 



Physiographic barriers . . 285 



Pickhng 98 



Pike 275 



Pine 149 



Pineal body 198, 200 



Pistachia 367 



Pistil 9 



Pituitary body 200 



Pith 145 



Pitted vessels 146 



Placenta 215 



Planarian 354, 523 



Plankton net 521 



Plasticity . ■. 264 



Plasmodium loi 



Play 499 



Plover 426 



Pocket gall 40 



Polar bodies 297 



Polarity 359 



Pollen 7,9,21, 402 



Pollen basket 23 



Pollen distribution 400 



Pollen sacs i.\g 



Pollen tube 9,1 50, 1 53 



Pollination 402 



Polyembryony 337 



Pond animals 386 



Pond life 385 



Pond snails 523 



Pons 463 



Pores 120 



Post-em.bryonic develop- 

 ment 343 



Potato 7.361 



Potential energy 84 



Pouched mamma's 242 



Prairie 6 



Precava iSS 



Preserves 98 



Pride of ancestry 321 



Primary differentiation .. 219 



Primary food of animals . 3 



Primary germ layers 171 



Primates 4S5 



Primitive haunts 251 



Proboscides 19 



Process of evolution 266 



Progress in regression .... 263 



