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 Pinna, 181.

Pinnate, 74.

Pinnatifid, 76.

Pistil, 135.

Plantain, 157.

Plant societies, 9.

Plants, unlikeness of, 9.

Plastron, 141.

Pleura, 76.

Plexus, 128.

Plumule, 20, 23, 25.

Plur-annual, 18.

Pod, 164.

Poison, 137.

Pollen, 135, 144, 180,  85.

Pollen basket, 88.

Pollination, 144, 145; artificial, 153.

Polyp, 9, 22, 125.

Polypetalous, 134.

Polysepalous, 134.

Polytrichum, 199.

Pome, 169.

Portal vein, 105.

Portuguese man-o'-war, 28.

Posterior curvature of spine, 37.

Potato, 92, 95, 112; bug, 90.

Practical questions, 50, 69, 87, 112, 136.

Primates, 220.

Primitive man, 3.

Primrose, 149.

Proboscis, of butterfly, 83, 87; elephant, 207.

Prolegs, 84, 87.

Propagation by buds, 121.

Prop-roots, 36.

Protection of birds, 171.

Protective resemblance, 34, 146.

Proteid, xi, 88, 91, 92, 94, 95, 96, 104.

Proterandrous, 146.

Proterogynous, 146.

Prothallus, 178, 202.

Protoplasm, xiv, 42, 94, 97, 185,  6, 11,  5, 6, 59, 106, 118.

Protozoa, 7, 9, 11, 125.

Pruning, 105.

Pseud-annual, 17.

Pseudoneuroptera, 82.

Pseudopod, 11.

Pteridophytes, 181, 201, 203.

Ptyalin, 100.

Puffball, 194.

Pulse, 55.

Pure food law, 93.

Pylorus, 103.

Pyxis, 166.

Quarantine, 163.

Quarter-sawed, 70.

Quill, 156.

Rabbit, 205, 223.

Radial symmetry, 34, 125.

Ration, daily, 94, 96.

Rattlesnake, 145.

Reaction, 151, 152.

Receptacle, 134, 163.

Rectum, 134,  97.

Reflex action, 121.

Regeneration of lost parts, 37.

Rennin, 103.

Reproduction, 12, 15, 20, 25, 37, 46, 120.

Reptiles, 139.

Respiration, cellular, 81; human, 70; hygiene of, 80; in plants, 97, 103.

Resting spore, 184, 185, 189, 191, 192.

Retina, 151, 152.

Rhizome, 52, 202.

Rhizopoda, 16.

Road runner, 169.

Robin, 183.

Root cap, 44.

Root climber, 129.

Root hairs, 41, 42, 46.

Rootlet, 41.

Root pressure, 99, 104.

Roots, and air, 41; forms of, 32; function, 38; structure, 38, 43; systems, 32.

Rotifer, 49.

Round worm, 49.

Ruminant, 213.

Rust, 192.

Salamander, 134, 138, 139.

Saliva, 96, 100, 112.

Salt, x, 93.

Samara, 164.

Sand, xiii.

Sandworm, 49.

Sanitary map, 158.

San José scale, 95.

Sap, 67.

Saprophyte, 107, 108.

Scab in sheep, 95.

Scales, of bird, 161; fish, 110; moth, 89.

Scallops, 104.

Scape, 161.

Scarab, 90, 91.