INDEX — GLOSSARY. 



453 



Peduncle, ii6 



Pelican, 650 



Pellicle, 338 



Pelmatozoa, 551 



Penguin, 650 



Pentadactyl appendages, 637 



Pepsin, 461, 463 



Peptones — soluble proteid compounds, 



459 

 absorption of, 472 



Perch, 636 



Perennial, living on from year to year. 



Perianth, 122 



Pericardial cavity, 471 



Pericardium, origin of, 721 



Pericarp — the wall of the ovary when 

 the fruit is mature. 



Peridermium, 227, 228 



Perigynous, 134 



Perilymph, 399 



Peripatus, 157 



Perisarc, 339 



Perisperm, 53 



Perisporeacese, 257 



Perissodactyla, 666 



Peristome, 247 



Periostracum, 605 



Perithecium — (of fungi) an urn-shaped 

 fruiting receptacle, 257 



Peritoneum, origin of, 721 



Peritricha, 515 



Petiole, 24, 25 



Petals — the parts of the corolla, 132 



Phajophyceae, 245 



Phaeosporeae, 246 



Phagocytosis, the destruction of bac- 

 teria by the white blood cor- 

 puscles — phagocytes, 776 



Phanerogams, flowering plants, 292 



Pharynx, of tunicates, 619 



Phascaceae, 278 



Pheasant, 650 



Phenacodus, 666, 807 



Phloem, the part of the vascular 

 bundle containing the sieve 

 tubes. 



Phosphorescence — luminescence. 



Phosphorus, 679 



Photogenic — producing light. 



Photosynthesis — the process by which 

 organic substances, such as 

 starch, are formed by the 

 agency of chlorophyll in sun- 

 light, 87 



Phycocyanin, 232 



Phycoerythrin, 248 



Numbers refer to paragraphs ; Black Fac 



Phycophaein — a brown pigment con- 

 tained in the brown sea- 

 weeds, 245 

 Phycomycetes, 249 



Phyllotaxy — leaf arrangement, 30-33 

 Phyllopoda, 559 

 Phylloxera, 763 



Phylogey, the history of the develop- 

 ment of the race. 

 Phylogcnetic series, 802 

 Physalia, 134 

 Physiographic relations of plants, 219- 



223 

 Pici, 650 

 Pigeon, 650 



Pigment layer of eye, 379 

 Pike, 636 

 Pill bug, 561 

 Pine, 35 

 Pineal eye, 796 

 Pinnipedia, 664 

 Pisces, 628 



structure of, 628 

 Pistil, 29, 125 



Pistil — megasporophyll, 298 

 Pith, 61 

 Placenta, 126 

 Plant bugs, 591 

 Plants, color of, 18-22 

 Plant hairs, 100 

 Plantigrade — standing on the whole 



sole of the foot, 663 

 Plant lice, 591, 763 

 Plant series, 793 

 Planula, 528 



Plasmodium — the amoeboid stage of 

 the body of a slime mold, 

 252, 240, 768 

 Plastron, 643 

 Platyhelminthes, 534 

 Platyrhina, 668 



Pleura, the membrane covering the 

 lungs and lining the thoracic 

 cavity. 



origin of, 721 

 Pleurobrachia, 531 

 Plumule, 55 

 Pocket-gopher, 660 

 Poison gland, 567, 569 

 Polar body, 696 

 Pole cat, 663 

 Pollen, 123 



grain — microspore, 293 



protection of, 137 



selection of, 147 



tube nucleus, 204 

 e numbers refer to figures. 



