Macrospore, def., 446 



Madder family, 88, 89 



Maggot, 45; def., 411; and spontaneous generation, 



411 

 Magnesium, 109, 111 



Maize (corn), rliromosome number, 459 



Malaria. 311, 319-351; deaths from, 349; mosquito, 

 349; our success with. 353-354 



Malarial protozoan, fertilization in. 351; life history, 

 350-351, 350; reproduction, 417-418 



Male, ant, 47; characteristics, 421-422; deer, 421; 

 frog, 422; gametes, 423, 423; malarial protozoan, 

 351, 418; sex organs, 421, 422, 422 



Malnutrition, 364 



Mammals, 16-20; Age of, 538-539; behavior, 274, 

 291, 295-296, 297; brain, 271, 273; characteristics, 

 16; embryo in uterus, 432; explanation of dis- 

 tribution, 552; family life, 434; flying, 18; gnaw- 

 ing, 18; with grinding teeth, 16-17; with long 

 eyeteeth, 17-18; marine, 18; parental care, 433- 

 434; reproduction, 432-434; simple, 18-20 



Mammary (milk) glands, 16, 433 



Mammoth, fossils, 528 



Man, arm bones of, 547; as biologist, 3-13; as 

 breeder, 493-507; behavior of, 260-300; breath- 

 ing of, 226-236; cells and tissues of, 129-132; chro- 

 mosome number of, 459; circulation of, 206-225; 

 classification of, 564, 573-574; diet of, 167-187; 

 digestion of, 188-205; and disease, 311-371; egg 

 of, 423; embryo of. 549; endocrine glands of, 246- 

 258; and environment, 373-409; excretion of, 

 237-245; heredity in, 508-519; and higher plants, 

 382-383: history of, 56-4-579; improving mankind, 

 512—516; and insects, 389-398; and population 

 growth. 382; and racial classification, 574; skuU 

 of, 193; sperm of, 423; time clock for, 566, 568 



Manson, Patrick, and malaria, 349 



Manure, def., 405: and tetanus, 330-331 



Maple. 83, 101, 141; fruits, 445; leaf of red, 85 



Marble, 524 



Marriage, regulation of, 512-513; and syphilis, 332 



Marsupials, 18-20, 19, 433, 552; geographic dis- 

 tribution of, 552 



"Master gland," 254 



Maturation, def., 460; of gametes, 460-461, 461 



Maze, 291 , 291, 292 



McGregor, Prof. J. H., and fossil man, 567 



Mealy bug, 47 



Measles, 340 



Mechanical energy, 120 



Media, for raising bacteria, 313; solid, 313-314 



Mediterranean, fruit fly, 396; race, 575 



Medulla, 271-273; and breathing, 232; human, 271; 

 vertebrate, 273 



Membranes, of blood vessels, 215; cell, 106, 106, 

 107; in diffusion, 122-124, 123, 150-151, 189, 

 198, 231; ear, 282; embryonic, 432, 433; fertiliza- 

 tion, 424; of lungs, 227, 228; mucous, 131, 192, 

 195, 195, 197, 198, 198, 200, 228; nervous system, 

 271; nuclear, 107, 457, 458; plant epidermis, 133; 

 serous, 131, 194. 216 



Mendel, Gregor, and heredity, 467-472 



Mendelian ratio, 469; explained, 466-467 



Meninges, 271 



Mental health, 367-368; and alcohol, 366-367; of 

 adolescents, 368-369 



Mental illness, 369 



Mental traits, heredity, 510-512 



Merino sheep, 494 



Mesoderm, 426 



Mesozoic era, 533, 534, 537-538 



609 



Metabolism, def., 170; and tagged atoms, 250; basal 



170 

 Metamorphic rock, def., 524; examples of, 524 

 Metamorphosis, def., 429; of frog, 428-429, 428; of 



insect, 42 

 Metchnikofi". Eli. and phagocytes, 210 

 Microorganism, def., 63; 61-64; and man, 311-360, 



383-385 

 Micropyle, 442, 443 

 Microscope, 11, 105, 106, 113; directions for use of, 



114-115; eff'ect on image, 114-115; electron, 12; 



Leeuwenhoek's, 10; modern, 10; parts of, 113; 



ultraviolet, 12 

 Microspore, def., 446 

 Midget, 253, 254 



Migration, of birds, 22-23; of fish, 33-34; routes, 24 

 Milk, bottling of, 346; breeding for, 497; certified, 



347; inspection of plant, 347; raw, 346-347 

 Milk supply, and public health, 345-347 

 Milkweed, butterfly, 42; fruit, 445 

 MilHpedes, 52, 66 

 Mimosa, 304; behavior of, 305 

 Minerals, 110, 111; in diet, 175-176; movement in 



plants, 157-159; in protein synthesis, 142; in soil, 



148-150, 151; test for, 116; use of, 175; vitamin D 



and bone formation, 181 

 Mink, mutation, 498 

 Mint family, 88 

 Mites, 51 

 Mitosis, in animal cell, 458; def., 458; 456-459; in 



plant cell, 457 

 Mixture, 110-111, 112; and compound. 111; sugar 



and water. 111 

 Mockingbird, 21 

 Moisture, and bacteria, 315 

 Molars, 203 

 Molds, 75-77; of penicillin, 333, 334; reproduction 



of, 414-415, 414, 416-417, 417; and skin disorders, 



243 

 Molecules, 121, 122; not diffusible, 124 

 Mollusks, 40, 53-55, 54, 55, 66 

 Mongoloid, 574 

 Monkey, appendage, 549; chromosome number of, 



459 

 Monocots (monocotyledons), 83, 83, 84, 91; as food, 



84-85 

 Moran, John J., and yellow fever, 352 

 Morgan, Thomas Hunt, 456; and fruit fly, 470; and 



gene theory, 456 

 Mosaic disease, of tobacco, 340 



Mosquito, 44; chromosome number, 459; extermina- 

 tion of, 352-353; 353; life history, 352; and 



malaria, 349-351, 350; sucking blood, 349; and 



yellow fever, 351-354 

 Moss, 78, 78; classification of, 90-91; pigeon-wheat, 



73, 447; reproduction of, 447; Spanish, 138 

 Moth, 4.3-44, 43; life cycle, 43; sucking tube, 43 

 Mother cell, in reproduction, 413 

 Motion, of protoplasm, 125 

 Motor areas, of brain, 272 

 Motor neuron, 278 

 Mouth, anemone, 59; earthworm, 57; insect, 43, 



43, 44; man, 226; Paramecium, 62; tadpole, 428 

 Mucous membrane, def., 131; 192, 195, 227; of 



mouth, 106; of villus. 198 

 Mucus, 192, 195 

 Mule, and hybridization, 501 

 Mullein, 385 



MuUer. Hermann J., 481; and mutation, 481 

 Mumps, 340 

 Muscle, cardiac, 224; cells, 129; heart, 131-132, 214; 



