INDEX 
103 
Prostomium, 61 
Protein, 13, 14 
Prothorax, 67 
Protococcus, 31 
Pseudopodia, 58 
Ptyalin, 15 
Public highway, 48 
Pulmonary, artery, 52; vein, 52 
Pulp, 7 
Pulsation, 53 
Pulse, 53 
Pupa, 69, 72, 73 
Purification, water, 47, 48 
Quarter-sawed oak, 25 
Rabbit, 83 < 
Radial section, 25 
Radiating canal, 59 
Radicle, 9, 10 
Radish, 3, 17 
Ragweed, 8, 57 
Ray, 24 
Ray floret, 4 
Reaction, 76, 77 
Receptacle, 3 
Rectum, 68 
Red rust, 33 
Red-winged blackbird, 89 
Reproductive system, 63, 68 
Reptile, 82, 93 
Reservoir, 47 
Resistance, 40 
Respiration, 16, 29, 62, 78 
Respiratory, system, 51, 52, 54, 62, 
66, 68, 78, 80; tract, 37 
Rhizoid, 32 
Rhizome, 26 
Ribs, 49, 55 
Robin, 89 
Rochelle salts, 94 
Rodent, 83 
Root, 1, 2, 16, 17, 18; air, 16; brace, 
2; fibrous, 16; lateral, 2; soil, 16; 
storage, 16; tap, 16; verticle, 1; 
water, 16; woody, 16 
Root cap, 17 
Root hair, 17, 18 
Root stock, 26 
“Rosette” arrangement, 28, 87 
Rostrum, 64 
Rust, wheat, 33, 34 
Saliva, 15 
Salt, 44 
Sanitary conditions, 48 
“Sap-wood,” 25 
Scab, potato, 35 
Scale, 77, 82, 86, 88 
Scutellum, 10 
Sediment, 22, 46, 47, 48 
Seed, 8, 88 
Seed dispersal, 8, 9, 88 
Seedling, 10 
Segment, 61, 66 
Sepal, 3 
Shank, 79 
Sheath, 1, 2, 10 
Shell, 82 
Shoulder blade, 49 
Shrubs, 91 
Sight, 64 
“Silks,” corn, 2 
Skeleton, 49, 50, 82 
Skin, 80 
Skull, 49 
Slaked lime, 44 
Small intestine, 51 
Smell, 64 
Snake, 82, 83 
Sod, 22 
Sodium hydroxide, 94 
Soft palate, 51 
Soil, 22 
Sowbug, 76 
Sparrow, 75 
Sperm, 61 
Spinal cord, 81 
Spindle, 20 
Spines, 77 
Spiracle, 66, 67, 68, 69 
Spirogyra, 31 
Sporangium, 32 
Spores, 32, 33, 35 
Squash bug, 70 
Squirrel, 80 
