A., 95

Meckel, J. F., 113
Meckel-Serres Law, 91-3
Evolution, 92-3, 215, 228
Teratology, 93-4
Repetition of Parts, 95
Vertebral Theory of Skull, 96
Eclecticism, 101

Meckel's Cartilage, 141, 145

Meckel-Serres Law. _See_ "Development, Meckel-Serres Law"

Mehnert, E., 348, 350-2

Membrane and Cartilage Bones, 162-7, 309-10

Memory and Heredity, 336-44

Mendelism, 346

Mesenchyme, 298

Mesoderm, 209-11, 296, 297, 298

Metabolism--
Cuvier, 38
Schwann, 182-5
Roux, 324, 329

Metamerism, 94, 95, 100, 109, 131-2, 266-7, 274-5, 279, 282, 286, 299, 301

Metamorphosis of Plants, 48, 235

Metastasis, Principle of--
E. Geoffroy, 55-6, 59, 74
Owen, 106

Metschnikoff, E., 278 f.n., 285, 288
Criticism of Ascidian Theory, 271
Coelom, 295, 296, 297

Meyen, 170, 185

Meyer, E., 284

Meyranx, 64

Microscope, Invention of, 19

Milne-Edwards, H., 12, 86, 238
Marine Zoology, 195
Functional Attitude, 195, 197-200
Unity of Plan, 197
Division of Labour, 197-8
Ecological Adaptation, Convergence, 199
Von Baer's Law, Polemic with Serres, 204-8
Evolution, 244-5

Mirbel, 170, 171

Mivart, St G., 277

Mohl, von, 170, 185

Moldenhawer, 170

Moleschott, 194

Moquin-Tandon, A., 87

Morgan, T. H., 317 f.n., 332, 333, 347 f.n.

Mosaic Theory of Development, 330-3

Mueller, F., Biogenetic Law, 252-3, 254, 257

Mueller, H., 166

Mueller, J., 136, 209 f.n., 260, 285, 309, 345
Embryological Criterion, 138
Vertebral Theory of Skull, 142-4, 154, 157
On Reichert, 150
Cell Theory, 172-3
Division of Egg-nucleus, 188
Vitalism, 192
Marine Zoology, 196
Functional Attitude, 200

Mutations (Waagen), 361 f.n.

NAEGELI, 185, 243 f.n., 356

_Naturphilosophie._ _See_ "Philosophy of Nature"

Nesbitt, R., 162

Neumayr, 357, 360

Nussbaum, M., 330

OKEN, L., 89, 113, 131, 134, 149
Meckel-Serres Law, 90-1
Teratology, 91
Repetition of Parts, 94-5
Serial Homology, 95-6, 100
Vertebral Theory, 96, 97, 98
On Geoffroy, 100
Influence on Serres, 205
Evolution, 215

Ollier, 315

Oppel, A., 318 f.n., 324 f.n., 327, 348-9

Orr, H. F., 342

Osborn, H. F., 214 f.n., 361
On V. O. Kowalevsky, 362
Functional Attitude, 362-4
Law of Adaptive Radiation, 362-4

Owen, R., 97, 102-12, 204
Eclecticism, 102
Vertebral Theory of Skeleton, 103-7
Archetype of Vertebrate Skeleton, 104-7, 110
Vertebral Theory of Skull, 104-6