chert, C. B., Embryological Criterion, 138-9, 144-7, 163
Archetype, 139, 147, 149
Homologies of Gill-arches and Ear-ossicles, 144-7
Vertebral Theory of Skull, 147-9, 157
Von Baer's Law, 149-50, 351 f.n.
Membrane and Cartilage Bones, 163, 165, 166, 310
Criticism of "Biological Atomists," 192-3, 194
Functional Attitude, 193, 200

Remak, R., 118, 288 f.n.
On Vertebrae, 157
Cell Theory, 173, 187-8, 209
Microscopical Technique, 209 f.n.
Germ-Layer Theory, 209-12, 296
Cells, Tissues and Germ-Layers, 209-12
Mesoderm, 209-11
Coelom, 211, 296

Repetition of Parts within the Organism, Theory of. _See also_
"Vertebral Theory of Skull"
Goethe, 48-9
Duges, 87-8
Oken, 94-5
J. F. Meckel, D. A. Meckel, 95
Haeckel (Tectology), 249-50

Reymond, E. du Bois, 194, 314

Rignano, E., 343-4

Robinet, 23, 215

Rondeletius, 18

Rosenhof, Roesel von, 22

Roux, W., 313, 315-29, 344, 351
_Entwicklungsmechanik_, 315, 317-8
Materialistic Attitude, 315, 317, 318-9, 329
Functional Adaptation, 316-7, 318, 320-9, 333
Experimental Embryology, 317, 318, 330-1
Simple and Complex Components, 318-20
Functional Definition of Life, 320
Functional Attitude, 320-9, 335
The Two Periods of Development, 320-4, 325, 327, 335
Mosaic Theory of Development, 323, 330-1
Metabolism, 324, 329
Structure, Functional and Non-functional, 324-6
Functional Unity of Organism, 326
Functional Adaptation of Blood-vessels, 326-9
Form as manifestation of Activity, 329

Ruini, C., 18

Rusconi, 133-4, 186

Ruetimeyer, L., 361

Ryder, 361

SACHS, J. von, 170

St Ange, M., 146

Salensky, 259

Saltatory Variation--
E. Geoffroy, 78
Von Baer, 242
Koelliker, 243
Owen, 244

Sarcode, 169

Sars, M., 186, 196

Savigny, J. C., 83-5, 100, 137, 271

Scale of Beings, 89, 206, 214-5
Aristotle, 14-6
Anaximander, Anaxagoras, 14
Empedocles, Plato, 15
Albertus Magnus, 17
C. Bonnet, 22-3
Robinet, 23
Buffon, 24
E. Geoffroy, 64
Lamarck, 215-8, 220-1, 227-8
As Evolutionary, 218, 220
Haeckel, 256-7
Criticism of this idea--
Cuvier, 39-40, 130
Von Baer, 130
Milne-Edwards, 205
Lereboullet, 207
Darwin, 234
Haeckel, 255
Relation to Evolution-Theory, 214-5

Schepelmann, 333

Schleiden, 170-2

Schmieden, 328

Schults, C. H., 173

Schultze, Max, 189

Schultze, O., 331

Schulz, E., 347 f.n.

Schwann, Theodor, 169,