526 



INDEX 



Mediterranean fruit fly, 411 

 Medulla, 147-149, 165, 202-205 

 Medullary plate, 269 

 Medusa, 71-74, 234 

 Megalithic monuments, 443 

 Meiosis, 244 

 Membrane bone, 141 

 Membranous labyrinth, 212, 213 

 Memory, 347 



Mendel, 288, 297, 469, 470; See: In- 

 heritance and Genetics 

 Mendel's laws, 297 

 Menengitis, 391 



Mental life, 217, 347, 431, 437, 444 

 Merozoite, 340 

 Merychippus, 362, 363 

 Mesenterial filament, 76 

 Mesentery, 133, 134, 147, 148, 153 

 Mesoblast, 265, 266 

 Mesoderm, 60, 61, 100-103, 134, 231 , 



238, 264-269, 272; bands, 265, 266 

 Mesogloea, 99, 100 

 Mesohippus, 362, 363 

 Mesolithic culture, 441, 442 

 Mesonephric system, 133, 184-186, 



190, 194 

 Mesozoic era, 359-361, 430 

 Metabolism, 18, 23-26, 159, 180-183, 



316-318; See: Anabolism and Ka- 



tabolism 

 Metacarpal, 142, 144, 355 

 Metals, age of, 444 

 Metamorphosis, of frog, 267-271; of 



insects, 96, 97, 406-410, 412, 413, 



415, 416 

 Metanephric system, 96, 117-120, 



184-187 

 Metaphase, 240, 241 

 Metaplasm, 19; See: Yolk 

 Metatarsal, 142, 144 

 Metatheria, 479 

 Metazoa, 66, 258, 260, 480 

 Metridium, 75, 76 

 Microbe, 38, 396; See: Bacteria 

 Microcosm, 43-45, 317; See: Web of 



life 

 Microgamete, 340; See: Sperm 

 Micronucleus, 4$, 54-56, 257, 259 

 Microorganisms and disease, 38, 39, 



389-396 

 Microscope, 15, 452-454, 466 

 Mid-brain, 201, 202, 268, 269 

 Middle Ages, 349, 449 



Middle ear, 213, 358 



Milk, 128, 153, 156; souring, 389 



Millipede, 91, 92 



Mimicry, 328, 329 



Mind, 217, 347 



Miocene epoch, 359, 362, 363, 430 



Miracidium, 396, 397 



Mite, 95, 219 



Mitochondria, 19 



Mitosis, 13, 239-243, 254, 304 



Mitral valve; See: Heart 



Mixed nerve, 208 



Moccasin, 123 



Modifications, 285, 286, 288, 289, 



313-315, 374, 380-384, 473, 474 

 Modifying genes, 300 

 Mold, 40 

 Mole, 323 



Mollusc, 86-90, 210, 216, 276, 478 

 Monad, 44 



Monkey, 130, 131, 367, 426-431, 480 

 Monocystis, 52 

 Monograph, 451 

 Monohybrid, 289-292 

 Monosiga, 51 

 Monotreme, 127, 190, 479 

 Moore's theory, 225 

 Morgan, 311 



Morphology, 3, 4; See: Anatomy 

 Mosaic inheritance, 287, 298-301 

 Mosquito, 53, 339, 340, 375, 392, 393 

 Moss, 361 

 Moss-animal, 83 

 Moth, 412-416 

 Motorium, 199 

 Motor nerve, 201, 206, 207 

 Moult, 96 

 Mouse, 129, 218 

 Mousterian culture, 439 

 Mouth, 132, 149, 152, 156, 162 

 Movement, 27, 28; See: Tropism 

 Mucus, 151 

 Mud-puppy, 118 

 Mud turtle, 121 

 Mulatto, 299, 300 

 Muller, 461 

 Multicellular organism, 7, 57-66 ; See: 



Metazoa 

 Multiple genes, 299, 300 

 Muscle, 27, 62-64, 102, 103, 133, 



135-138, 165, 201, 215; cells, 11, 



28, 138 

 Muskrat, 323 



