472 



INDEX 



Maxilliped, 142 



Mechanical energy, 17 



Mechanism, 5, 17 



Mechanism of Evolution, 388-396 



Mediastinum, i S7 , 138 



Medicine, 425, 432, 436 



Medulla oblongata, 172, 216, 218, 2ig 



Medusa, loi, 102, 259, 260 



Megagametocyte, 75 



Megagametophyte, 255 



Megaspore, 255 



Membrane, 29, 32, 35-37, 157, 162, 



166, 170, 171 

 Membrane bones, 147 

 Membrane permeability, 32, 278 

 Mendel, 320, 424 

 Mendelian Laws, 322 

 Mesencephalon, 21 y, 218 

 Mesoderm, 103, i^i, 132, /j6, 145, 



147, 186, 268, 270, 271 

 Mesoglea, 258 

 Mesolecithal eggs, 266 

 Mesonephros, 186, 187, 197 

 Metabolism, 40, 43, 46, 47, 61, 71, 73, 



77, 79, 82, 88, 155, 163, 184, 188, 



191, 202, 203 

 Metagenesis, 251-263 

 Metamere, 109, 138, 139 

 Metamerism, 408 

 Metamorphosis, 203, 358 

 Metanephros, 186, 187 

 Metaphase, ^08 

 Metaphyta, 46, 47, 76, 88 

 Metatheria, 120 

 Metazoa, 46, 47, 88, 90, 91, 92, 96, 99, 



130, 131, 134, 166, 210, 247, 258, 



262, 265, 384 

 Metencephalon, 277, 218 

 Metridium, 102 

 Mexican jumping bean, i, 428 

 Mice, 121 

 Micrococci, 82 

 Microgametocyte, 74, 75 

 Microgametophyte, 255 

 Micron, 22 



Micronucleus, 6^, 66, 6g, yo, 71 

 Microspore, 255 

 Middle ear, 230, 233 



Milk, 87, 162 



Millipede, iij, 114 



Milton, 389 



Mimicry, 359, 391 



Mind, 370 



Mitochondria, 29, 30 



Mitosis, 306-311 



Mitotic spindle, 308, jio, 311 



Modifications, 320 



Mold, 76, 77 



Mole, 121 



Molecule, 8, 9, 22-24, 60, 162, 165, 176 



Mollusca, 109, no, III, 125, 213, 214, 



249, 401 

 Molluscoidea, 10^, 107, 108, 125, 401 

 Monkeys, 122, 406 

 Monoblastic, 130 

 Monohybrids, 321 

 Monopolar neuron, 211 

 Monotremata, 121 

 Mosquito, 74, 75, 361, 362 

 Moss, 76, 77, 252, 253 

 Moss, life cycle, 2^j 

 Moths, 359, j6o 

 Motor nerves, 212 

 Mouth, 273, 274 

 Mud puppy, 169 

 Miiller, 411 



Multicellular animals. See Metazoa, 

 Multicellular plants. See Metaphyta. 

 Multiple genes, 330 

 Multipolar neuron, 211 

 Musca domestica, 124. See also House 



fly. 

 Muscidae, 123 

 Muscinae, 124 



Muscle cells, 47, 48, 240, 241 

 Muscle worms, 106 

 Muscles, 241 , 242 

 Mushrooms, 77 

 Mussel, III 

 Mutations, 320, 333, 341, 348, 392, 



393, 394 

 Myelencephalon, 2iy, 218 



Myopia, 227 



Myriopoda, 113, 114; 125 



Nails, 722 



J 



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