Index 885 



Ovule, 140,* 142, 143, 200-204, 206, 



208, 216, 225, 225* 

 Ovum (egg), 133,* 143, 201-203, 286,* 



389,* 450,* 514, 515, 708,* 



709, 710* 

 Oxygen, 79,* 81,* 83,* 228, 489-493, 



632 

 Oxyhemoglobin, 434, 484 

 Oxytocin {see Endocrine glands) 

 Oxyuris, 661 

 Oyster, 311 



Paedogenesis (pedogenesis), 848 



Palaearctic region, 597 



Palate, 469* 



Paleobotany, 605 



Paleontology, 24, 605, 736 



Paleozoic era, 614, 617 



Paleozoology, 605 



Palisade tissue, 145,* 195 {see also 



Tissues, plant) 

 Palm, 142,* 143, 203, 204, 261 

 Palp, 307,* 313,* 395,* 404,* 410, 410* 

 Pancreas, 340,* 427,* 428, 429, 471,* 



476, 477, 507,* 508, 511 

 Pangenesis, 848 

 Papilla, 302,* 381, 421, 448, 459, 460,* 



494 

 Parallelism, 593,* 729, 738* 

 Paramecin, 357 

 Paramecium, 278,* 279, 349-357, 350*- 



356* 

 Paramylum, 359 

 Paraphyses, 127,* 162, 176, 186 

 Parapodium, 306, 307,* 308 

 Parasite, 129, 133, 151, 152, 168, 177, 



179, 183, 197, 201, 293, 297, 



635, 658 {see also Bacteria; 



Fungi; etc.) 



Parathormone, 507* 



Parathyroid, 507,* 508, 511 {see also 



Ductless glands) 

 Parenchyma, 130, 141,* 145,* 220, 

 293, 373 {see also Tissues, 

 plant) 

 Parthenogenesis, 162, 168, 298, 301, 



361,* 363 

 Parthenogonidia, 363 

 Passenger pigeon, 610* 

 Pasteur, Louis, 733, 803 

 Pathogenic, bacteria, 120, 122, 168, 

 171, 255, 659, 660 

 molds (fungi), 659, 660 

 protozoa, 274, 660 

 viruses, 789, 790 

 yeasts, 660 

 Pathology, 24, 848 

 Peat moss, 133, 134,* 189, 258 



Pebrine (silkworm disease), 535, 786 

 Pecten, 401,* 403 

 Pedicellaria, 302,* 304 

 Pedigree, 673, 715, 716,* 717* 

 Pedipalp, 325* 

 Pedogenesis, 848 

 Peduncle, 216 

 Pelecypoda, 311, 312* 

 Pellagra, 474, 771,* 772 

 Pellicle, 276,* 278,* 349, 350,* 353,* 

 354,* 358* 



Peltate, 203 

 Pelvic, 462,* 466 

 Pen, 290, 315* 

 Penial seta, 380,* 382 

 Penicillin, 250, 251* 

 Penicillium, 126,* 127, 129, 175, 250, 

 251,* 671 



Penis, 311,* 312,* 315,* 371,* 372, 



374* 

 Pentamerous, 301, 303 

 Pepsin, 429, 476 

 Peptone, 476 

 Perch, 330*-332,* 331 

 Perennial, 200, 214 

 Perianth, 208, 224 

 Pericardium, 309, 311,* 313,* 324,* 



325,* 395, 478 



Pericarp, 210 



Pericycle, 145,* 214, 220 {see also 



Tissues, plant) 

 Peridinium, 530 

 Periosteum, 849 

 Peripatus, 318, 324* 

 Peristome, 187, 307* 

 Perithecia, 177 

 Peritoneum, 47, 302,* 387* 

 Permeabihty, 743, 752, 753* 

 Petal, 144,* 208, 212, 217, 223,* 224, 



225,* 305* 



Petiole, 195, 215, 223 



Petrifaction, 605, 611 



Peziza (cup fungus), 127,* 129, 176 



Phaeophyta (brown algae), 109, 116, 

 118,* 153, 160-162, 249 



Phagocyte, 485, 518, 773 {see also Tis- 

 sues, blood) 



Phalanges, 423,* 425, 462,* 466 

 Pharynx, 276,* 279,* 296,* 308,* 311,* 

 325-343, 328,* 368-380, 385,* 

 • 396,* 469,* 471,* 491 



Phaseolus, 144,* 211-213 {see also 

 Bean) 



Phases, 76 

 Phenotype, 684-690 



Phloem, 133, 141,* 147* {see also Tis- 

 sues, plant) 

 Phosphorescent, 530 



