INDEX 



603 



Mass, 7, 15 



conservation, 15 

 Mast, S. O., 66 

 Mast cell, 99 

 Mastax, 186 

 Mastication, 468 

 Mastigophora, 78, 79, 80, 87 

 Mating, 493 

 Matter, 7-13 



living and non-living, 16-17 

 Maturation, egg cell, 109, 110 

 Maturation period, 107-110 

 Maturity, 43, 432, 433 

 Maxillae, 250, 272, 273, 386, 460 

 Maxillipeds, 250, 252, 269 

 Meadow mice, 481 

 Meandrina meandrites, 152 

 Meandrina sinuosa, 152 

 Mechanical energy, 37, 38, 430 

 Mechanism, 24 

 Medicinal leech, 245, 249 

 Medicine, 6, 492, 549, 554 

 Medulla, 32S, 337, 340, 368-370, 381, 395, 410, 



423 

 Medullary groove, 371, 372 

 Medullary sheath, 100 

 Medullary tube, 307, 372 

 Medusae, 142-145, 147-150 

 Megalops, 264 

 Meyarhyssa Junntor, 291 

 Meiosis, 108, 109 

 Melanoplus fcmur-rubrum , 280 

 Membrane of Reissner, 331 

 Membrane bones, 319 

 Membranelles, 85 

 Membranes, 11, 12 



basement, 97, 254, 255, 437 



cell, 28, 09 



nuclear, 29, 30, 46-48 



plasma, 28, 30 



semipermeable, 12, 21, 28 



undulating, 71 



vestibular, 331 

 Membranous labyrinth, 330 

 Memory, 464, 469 

 Mendel, 529, 533, 554 

 Mendelism, 529 

 Meridional canals, 154, 155 

 Meroblastic egg cells, 118, 375, 376, 419, 449 

 Merriam, C. H., 507 

 Mesencephalon, 328 

 Mesenchyme, 98, 120, 436, 441, 450 

 Mesenchyme cells, 184 

 Mesenteric artery, 339, 409 

 Mesenteric vein, 409 

 Mesenteries, 144, 145-146, 317 

 Mesoderm, 120, 122, 123, 127, 128, 146, 155, 157, 



164, 307, 418, 419, 449-450 

 Mesodermal pouches, 450 

 Mesoglea, 135, 136, 142, 438 

 Mesomere, 450 



Mesonephric duct, 317, 325, 326 

 Mesonephric tubules, 325, 326 

 Mesonephros, 317, 325, 326, 341, 351, 364, 442 

 Mesonotum, 271 



Mesopterygium, 361 

 Mesosoma, 299, 300 

 Mesothelium, 120, 450 

 Mesothorax, 271, 272 

 Mesozoic era, 511, 513, 515 

 Metabolic gradient, 1(J3, 237 



water, 455 

 Metabolism, 16, 17, 21, 32-39, 40, 41, 42, 65, 71, 



131, 138, 148, 161, 167-168, 177-178, 196, 



212, 225, 230, 245-246, 298, 455, 460-466, 



487, 488, 518 

 Metacarpals, 319, 321, 391 

 Metagenesis, 106, loO-l-Jl, 174, 313 

 Metals, 8 

 Metameres, 51, 229, 230, 232, 233, 237, 241, 243. 



245, 246, 250, 251, 252, 268, 269, 271, 272, 



273, 307, 325-326, 545 

 Metamerism, 51, 241, 304, 308, 366, 545, 547 

 Metamorphism, 512 

 Metamorphosis, 171, 172, 198, 206, 264, 265-267, 



278-279, 280, 281, 286-290, 292, 312, 313, 



314, 337, 356, 373-374, 450 

 Metanephric tubules, 325, 326 

 Metanephridium, 442 

 Metanephros, 326, 375, 442 

 Metanotum, 271 

 Metaphase, 47, 48 

 Metaplasm, 30 

 Metapleural folds, 313, 314 

 Metapterygium, 361 

 Metasoma, 299, 300 

 Metatarsals, 319, 321, 391 

 Metathorax, 271, 272 

 Metazoa, 40, 78, 93-95, 105-106, 127, 128, 435, 



440, 442, 449, 466, 488 

 Metencephalon, 328 

 Meteoritic theory, 26 

 Metridium dianthus, 145 

 Mice, 414 



Microgametes, 44, 86, 88, 89, 442 

 Microgametocytes, 88, 89 

 Micromeres, 371 



Micronucleus, 70, 71, 74, 75-77, 85 

 Micropyle, 448 

 Microscope, 552 

 Microscopists, 552 

 Mid-brain, 328, 369 

 Middle ear, 330, 331, 362, 364 

 Middle layer, 130 

 Midges, 106 

 Mid-gut, 438 



Migration, 264, 354, 402-403, 501-502 

 Milk dentition, 407 

 Milk glands (.see Mammary glands) 

 Millepora, 161 

 Millipedes, 270 

 Milt, 355 



Mimicry, 486, 486 

 Mind, 475 

 Minks, 413 

 Miracidium, 171, 172 

 Mites, 300-302, 497 

 Mitochondria, 30 

 Mitosis, 46-50, 518 

 Mixtures, 10 



