INDEX 
Abdomen, 50,64,65, 66, 67, 68, 69, 70 
Abdominal walls, 50, 55 
Adaptation, 4, 8, 72, 77, 82, 83, 94 
Adenoid, 52 
Adult, 71, 72, 74 
Air, 11, 12, 54; tidal, 54; comple- 
mental, M; reserve, 54; residual, 
54 
Albumin, 13 
Alg®, 31 
Alum, 47, 48 
Ammonia, 13 
Amoeba, 57, 58 
Animal, 58, 60, 61, 63, 75, 76, 82, 
84, 85 
“Annual ring,” 25 
Antenna, 64, 67, 69, 70, 71, 72 
Antennule, 64 
Anther, 3 
Anus, 62, 80 
Aorta, 50, 52, 80 
Appendage, 65 
Appendix, 51 
Apple, 7 
Aquarium, 77, 78, 81 
Arches, gill, 78 
Arm, 49, 79 
Arrangement, 23, 28; bud, 86; 
leaf, 27, 28, 29, 30, 90, 91, 92 
Artery, 52 
Auricle, 52, 80 
Axil, 23, 27 
Bacteria, 40, 41, 42, 43, 44, 45 
“Balance in Nature,” 75 
Barberry, 34 
Bark, 23, 90, 91 
Beak, 83 
Bean, 7, 9, 10, 14 
Behavior, 89 
Bile duct, 51 
Birds, 75, 83, 89, 93 
Black rust, 34 
Bladder, urinary, 80 
Blade, 1, 2, 27 
Blood, 52, 80 
Blood vessel, 65; dorsal, 61, 62; 
ventral, 62 
Blue grass, 1, 22 
Body, 58, 59, 60, 61, 64, 66, 67, 77, 
79, 82, 83, 84; covering, 66, 72, 
73, 77, 79, 82, 83, 84; divisions, 
66; parts,* 72, 73 
Borer, 85 
Boric acid, 45 
Bract, 3, 4, 87 
Brain, 68, 81 
Branch, 23, 28, 65 
Branching, 26, 27, 90, 91 
Bread mold, 31 
Breast bone, 55 
Breathing, 55; quiet, 54; deep, 55 
Breeding place, 73, 74 
Bristles, 62 
Bud, 23, 86, 90, 91; terminal, 23; 
lateral, 23 
Bur, 7 
Butterfly, 71 
Cabbage butterfly, 71, 72; “worm,” 
71 
Calyx, 3, 7 
Cambium, 24 
Canal, radiating, 59 
Cane sugar, 13, 36 
Carapace, 64, 82 
Carbolic acid, 44 
Carbon dioxide, 16, 29, 55, 94 
Cat, 75 
Cell, 14, 17, 19, 20 
