700 



INDEX 



Man — Continued 



applied to, 636-640; place in nature 

 of, 274-277 ; sense organs in, 430 



Mandibles, of beetles, 61 



Material, needed by plant for food- 

 making, 154-155 



Matter, forms of, 24-25: meaning of, 

 19, 23 ; 



Medfly, 566 



Medicine, profession of, 649-650 



Mediterranean fruit fly, 566 



Medulla oblongata, 429 ; functions of, 

 433, 434 ; location of, 433 



Medullary rays, 167 



Mendel, Gregor, 670-671 ; work on 

 heredity, 620-624 



Mendel, Professor at Yale, work on 

 proteins, 325 



Mesoderm, development of, 618 j sys- 

 tems formed from, 617, 618 



Metabolism, basal, meaning of, 341 



Metamorphosis, 65 ; of frog, 253 ; of 

 monarch butterfly, 66, 67 ; of silk- 

 worm moth, 538-539 



Metchnikoff, theory concerning phago- 

 cytes, 664 



Micropyle, of bean, 117; of ovule, 85 



Migrants, 550-551 ; summer residents, 

 551 ; transients, 551 ; winter resi- 



Migration, of birds, 550-551, 595-596; 

 of fishes, 588 



Mildews, fungi, 196-197 



Milk, and disease, 468; care of, 468- 

 469 



Millepede, 239 



Milling, compared with making of car- 

 bohydrates, 160-161 



Mimicry, in insects, 81, 82 



Mineral matter, in living things, 27 



Mineral requirement, of body, 331-332 



Mineral salts, in soil, 139 ; needed by 

 plants, 140 ; taken in by root hairs, 

 149 



Mint family, 211 



Mistletoe, 288 



Mitosis, a form of cell division, 48, 49 



Modification, of stems, 172-173 



Molds, 198-199; effect on food, 199; 

 food of, 198-199; growth of, 198; 

 life history of, 199 ; prevention of, 199 



Mollusca, characteristics of, 242 ; classi- 

 fication of, 241 



Mollusks, 226 ; as food, 531-533 ; char- 

 acteristics of, 240, 242 ; classification 

 of, 241 ; examples of, 240-241, 242 



Monarch butterfly, life history of, 66-68 



Monocotyledons, 126, 127 ; arum family, 

 209 ; grass family, 208 ; lily family, 

 208-209; orchid family, 209; palm 

 family, 208 



Morgan, Thomas Hunt, work on fruit 

 fly, 627-628, 670 



Morton, and anaesthesia, 664 



Mosquito, malarial, 484-486; yellow 

 fever, 487-488 



Moss, life history of, 202-203 



Moth, codling, 565 ; life history of, 237 ; 

 tussock, 565 



Mother-of-pearl, value of, 542, 543 



Moths, classifications of, 59, 238 ; com- 

 pared with butterflies, 68-69 



Motion, characteristic of living things, 43 



Motor axon, 431 



Mouth cavity, 363-367; structure of, 

 363-364 ; teeth, 365-366 



Mucous membrane, in food tube, 363 



Muscles, 314 ; relation to bones, 318- 

 322 



Mussel, life history of fresh-water, 593 



Mustard family, 210, 211 



Mutants, examples of occurrence, 632- 

 633 ; importance in breeding, 633 



Mutations, 671 



Mycelia, of fungi, 194 



Nails, outgrowths of epidermis, 316 



National government, and health, 600 



Natural immunity, 475 



Naturalist, profession, 653 



Naturalists, 668-669 



Natural resources, conservation of, 2, 

 572-601 



Natural selection, theory of Darwin, 605 



Nature, man's place in, 274-277 



Nemathelminthes, characteristics of, 

 228 ; classification of, 228 ; harmful, 

 493-496 



Nerve, description of, 431 



Nervous system, autonomic, 430 ; cen- 

 tral, 430 ; functions of , 434-435 ; good 

 health habits of, 447-448 ; laboratory 

 exercise on, 429-430 ; of birds, 264 ; 

 of crayfish, 235 ; of fish, 247 ; of frog, 

 252 ; parts of, 429 



Neuron, associative, 431 ; description 

 of, 430-431 ; diagram of, 431 ; motor, 

 431 ; sensory, 431 



Neuroptera, order of insects, 238 



Nictitating membrane, in frog, 250 



Nitrogen, cycle, 187-188, 285 ; fixation, 

 188 ; relation of bacteria to free, 187- 

 188 



Nitrogen-fixing bacteria, 187-188 



Noguchi, 665 



Nose, common diseases of, 407-408 



Nucleus, in cells, 46, 48 ; in root hair, 

 145 



Nutrients, 327-328 ; best proportion in 

 diet, 340-343 ; calories needed of 

 various, 341 ; how and where digested, 

 381 ; meaning of, 30 ; organic, 30-31 ; 

 test for in beans, 119-120; test for 

 oil, 118-119; test for protein, 119; 

 test for starch, 118 



Nutrition, processes of, 44-45 



