Anaximenes, 1

Animal and Vegetative Lives--
Aristotle, 16, 32
Buffon, 26-7
Bergson, 26 f.n.
Cuvier, 26, 32
Bichat, 27-9
Oken, 94
K. G. Carus, 94
Von Baer, 116, 123, 131
Remak (Sensory and trophic layers), 210
Gegenbaur, 263

Annelid Theory of Vertebrate Descent, 274-85, 301

Archetype, Anatomical, 246, 302-3
E. Geoffroy, 54, 67
Owen, 104-7, 110
J. V. Carus, Huxley, 204
C. Darwin, 238 f.n.

Archetype, Anatomical, as Ancestral--
C. Darwin, 235, 247
Haeckel, 251
Gegenbaur, 265
Sedgwick, 300
Criticism of this idea--
O. Hertwig, 355-7

Archetype, Embryological, 168, 246, 302-3
Von Baer, 126, 132
Reichert, 139, 147, 149
Rathke, 151, 153
Huxley, 159-61

Archetype, Embryological, as Ancestral--
C. Darwin, 233, 236-7
Haeckel, 254, 289-91
Gegenbaur, 266
O. and R. Hertwig, 298
Sedgwick, 300
A. Kowalevsky, 300

Arendt, 162

Aristotle, 2-16, 17, 345, 364
_Historia Animalium_, 2
_De Partibus Animalium_, 2, 9
Knowledge of Animals, 3, 4
Comparative Embryology, 4
Classification of Animals, 4-6
Unity of Plan, 6-7, 10
Homology and Analogy, 7-10
Teleology and Correlation, 10-12
Law of Compensation, 11
Division of Labour, 12
Degrees of Composition--homogeneous and heterogeneous parts, 12-14, 169
Law of Development (Von Baer), 14
Scale of Beings, 14-16
Functional attitude, 15-16, 197
Animal and Vegetative Lives, 16, 32

Ascidian Theory of Vertebrate Descent, 269-73, 304

Atomists, 16

Atomists, "Biological," 192-4

Audouin, V.--
Unity of plan in Arthropods, 85-6
Law of Compensation, 86
Marine Zoology, 195

Autenrieth, 90, 96

Avicenna, 17

BABAK, E., 333

Baer, K. E. von, 113-32, 133, 251, 304, 345, 356
Founder of Embryology, 113
_Entwickelungsgeschichte der Thiere_, 114
Regulation of Development, 114, 350
Development as Differentiation, 115, 128
Germ-Layer Theory, 115-6, 118-119, 208-9, 296
Morphological Differentiation, 116-7
Histological Differentiation, 117-8
Tissues and Germ-Layers, 118
Double symmetrical Development, 118, 279
Criticism of Meckel-Serres Law, 120-3, 304
Theory of Types, 123-4, 289, 291
Law of Development, 124-6
Embryological Criterion, 126-8, 132, 138
Embryological Archetype, 126, 132
Types of Development, 127-8
Von Baer and Cuvier, 128-30
Functional attitude, 129
Relation to Transcendentalists, 129, 131
Criticism of Scale