INDEX 



Megaspore, defined, 117 

 Meiosis, predicted, 81 

 Melanerpes, 27, 28 

 Melanophore-expanding hormone, 55 

 Mendel, J. G., 82 



unknown to Darwin, 79 

 Mendelian inheritance, 201-206 



and the agnostic reaction, 82-83 

 Merychippus, 73, 74 

 Mesoglea, 136 

 Mesohippus, 73, 74- 

 Mesonephros, 48 

 Mesozoa, 135-136 

 Mesozoic Era, 63, 64 



duration of, 66 

 Metacarpals, 39 

 Metamorphosis, 60 

 Metanephros, 48 

 Metasequoia, 312 

 Metazoa, origin of, 132-136 

 Methane, in atmosphere of stars, 93 

 Mez, C, 58-59 

 Mice, 332-333 



Perotnyscus, 248, 273, 274 



Phenacomys, 273 



pocket, 241 

 Microgametes, 106 

 Micronucleus, 131 

 Microspore, defined, 117 

 Miller, S. L., 94, 110 

 Millipedes, 145 

 Millot, J., 177 



Mimicry, Batesian and MijUerian, 244 

 Miocene Epoch, 64 

 Miohippus, 74 

 Mississippian Period, 65 

 Mitosis, bacterial, 98 

 Mivart, St. G., 178 

 Modern Synthesis, 84-85, 330 

 Modification, hereditary, 86 

 Moevus, F., 106 

 Mole, forehmb of, 38, 39 

 Mollusca, 141-142 



antiquity of, 141 



fossils of, 71 



morphology of, 141 

 Molluscoidea, 148 

 Monkeys, 179 

 Monocotyledoneae, 124 

 Monoecious, defined, 113 

 Monohybridism, 201-203 

 Monoplacophora, 141 

 Monotremata, 173 

 Montagu, M. F. Ashley, 198, 252 

 Moore, R. C., 75 



Morgan, T. H., 206, 207, 213, 214, 220 

 Morula, 134 

 Mosquito fish, protective coloration in, 



248 

 Moss, life cycle of, 112-113 

 Moths, Swiss, 274 

 Mountains, as barriers, 273 

 Mount Carmel fossils, 194 

 Muller, F., 244 

 MuUer, H. J., 209, 333 

 Multiple alleles, 203 

 Miintzing, A., 296, 302, 303, 307 



Murie, A., 274 



Muscle physiology, 59-60 



Mutation, 84 



chromosomal, 214-229 



defined, 83 



direction of, 208, 209 



experimental, 209 



innature, 207, 209, 211 



pressure, 256-257 



rate of, 208 



systemic, 226 



theory, 83 



thennodynamics of, 208 

 Mutica, 176 

 Mycetozoa, 100, 129 

 Mychota, 103 

 Myriapoda, 145 

 Myxomychophyta, 100, 129 



origin of, 124 



Nan Ling, 18 



Natrix, 274 



Natural selection, 5, 9, 78, 233-252 



and rate of evolution, 227-228 



experimentally demonstrated, 234-236 



favoring diversification, 37 



in man, 334 



moderate, 234 

 Nautilus, 142 

 Neanderthal man, 192-196 



characteristics of, 193-194 



relationships of, 194-196 

 Nearctic Region, 18 

 Nectunis, 57, 58 

 Needham, J., 51, 61 

 Nematocysts, 136 

 Nematoda, 139 

 Nematomorpha, 139 

 Nemeophila, 274 



Nemertean theory of chordate origin, 155 

 Nemertinea, 138-139 

 Neoceratodits, 19 



Neo-Darwinism, 209-213, 267-269, 329- 

 330 



difficulties of, 227-228 

 Neopilina, 141 

 Neotropical Region, 18 

 Neplirotome, 48 

 Neritic zone, 19-21 

 Nerve net, of coelenterates, 136 

 Neuromotor system, 131 

 Neurospora, synthesis in, 96 

 Newell, N. D., 153 

 Nicotiana, genome analysis in, 301-302 



hybrids of, 278 



species synthesis in, 300, 301 

 Nictitating membrane, 42-43 

 van Niel, C. B., 99, 110 

 Nonadaptive characters, and selection, 



250-251 

 Nordenskiold, Eric, 85 

 Notochord, 32 



Nucleic acid, in chromosomes, 55 

 Nucleotides, 55 

 Nutrition, autotrophic, 96 



heterotropliic, 95 



saprophytic, 97 



S47 



