INDEX 



vu 



Molting in cicada (si ka'dd), 28 

 Monocotyledons (mon 6 coty le'donz), 

 or monocotyls (mon 6 cot'ylz), 68, 



79' 434 ff- 

 Morning glory, economic value of, 



443 

 Morphin, 420, 438 



Mortality rates, for various diseases, 



313; infant, 359 

 Mosquito, 301, 322 ff. ; extermination 



of, 326 f. 

 Moss, 79 ; reproduction in, "]"] \ uses 



of, 433 f. 

 Moth, underwing, 85 ; clothes, 561 f. ; 



buffalo, 563, 565; gypsy, 565, 567, 



568 ; flour, 565 ; codling, 565, 569 ; 



brown-tailed, 568 

 Mouth breathing, 163, 164, 165 

 Mouth, of insect, 15 ; digestion in, 131 

 Movements in organisms, 18, 21, 56, 



57. See also Muscles 

 Mucin (mu'sin), 131 

 Mulberry, economic value of, 438 

 Mulch, 550 

 Muscles, contraction of, 217 ; kinds 



of, 251; fibers of, 252; importance 



of, 288 ff . 

 Mustard, economic value of, 438 

 Mutation, 499 f., 537 

 Mutualism, 300 

 My'6 sin, 102 

 Myriapoda (mir 1 ap'o dd), economic 



value of, 450 

 Myrtle, economic value of, 442 



Navigation and forests. 551 



Nerves, reaction in, 218 ; and reflexes, 

 218 f.; afferent and efferent, 219, 

 221; connections in, 219 f.; kinds 

 of, 221 f., 252 ; of eye, 230 f.; spinal, 

 281 



Nervous system, 212. 252; coordina- 

 tion through, 212 f.; and outside 

 world, 226 f. 



Neurons. See Nerves 



Newt, development of, 88 



Nicotin, 422 ff. 



Nictitating membrane. 277 



Nitrogen (ni'tro jen), 102, 300 n. ; 

 and bacteria, 109 f., 300 



Noise, 381 



Nose as sense organ, 228 f., 235 



Nose breathing, 163 



Nosebleed, 188 f. 



Nu'cle us, cell, 58 f. 

 Nu'tri ents, 102, 140, 146 f. 

 Nutrition. See Diet, Food 

 Nutritive ratio, 143 



Occupations. See Industry, Work 



Oc'to pvis, 86 



CEsophagus. See Esophagus 



Olive, economic value of, 442 



One-celled animals. See Ameba 



One-celled plants, 59, 113 



Oosphere (o'o sfer), 473 



Orchids (or'kidz), economic value of, 



437 



Organic substances, 18, 107 



Organisms, 17; chemical elements in, 

 17 f. ; composition of, 93 ; unity of, 

 211 f ., 268 f. ; good and bad, 41 5 f. 



Organs, 17 ; homology in, 35 f. ; anal- 

 ogy in, 36 f. ; of taste, 228, 235 ; of 

 smell, 228 f., 235 f. ; of sight, 230 f., 

 236 ff. ; of hearing, 232, 236 



Os mo'sis, 127, 129, 181, 229 



O'v^ ry, 42, 43 



Ovules (5'vulz), 41 



Oxidation in organisms, i6of. 



Oxygen, in protoplasm, loi, 104; a 

 by-product, 108 ; in photosynthesis, 

 425 



Palm, economic value of, 435, 436 



Pancreas, 132, 134 f., 177 



Yh pil'lae, 228 



Paramecmni (par d me'shi iim), con- 

 jugation in, 484 



Parasites, 300 f. ; injury done by, 

 302 ff., 322 f., 566. See also Fungi 



Parent, dependence of offspring on, 

 488 f. 



Parsley, economic value of, 442 



Pasteur, Louis, 304, 339, 449 



Pasteurization, 356 f. 



Patent medicines, regulations con- 

 cerning. 359 



Peanut plant, 440 



Pectoral girdle, 281 



Pedicel (ped'i sel), no 



Pel lag'ni, 304 



Pelvic girdle, 281 



Pepsin, 134 



Peptones, 133, 134 



Peristalsis (per 1 stal'sis), 134 



Perspiration, 199, 200 



Phagocytes (fag'6 sits), 178 



