106.
Mechanism, 277.
Meckel, 208.
Mesoderm, 193, 194.
Metridium, 104.
Michel, 190, 192.
Minchin, 105.
Minimal size, 55-57.
Molgula manhattensis, 237.
Mollusks, 104.
Morgan, 9, 30, 32, 33, 43, 44, 57-62, 64, 65, 68, 126, 131, 175, 185, 186, 187, 225, 231, 232, 237, 238, 243, 246, 247, 248, 249, 268.
Morphallaxis, 13, 270-271.
Mosses, 16, 17.
Moulds, 16.
Mouse, 178.
Mucor mucedo, 86.
Müller, E., 112.
Müller, Fritz, 100, 213.
Mus decumanus, 178.
Mus sylvaticus, 178.
Muscles, 114, 116, 120, 128, 181.
Myriapods, 100, 104; autotomy, 154.

Nägeli, 278, 280.
Nais, 104, 146.
Natural selection, 96, 108-110, 155-157, 262, 290, 292.
Necturus, 106.
Nematodes, 104.
Nemerteans, 104, 143.
Nereis, 143.
Nerves, 114.
Nervous system, 114.
Newport, 100, 154.
Nothnagel, 116, 117, 120.
Nucleus, influence of, 66, 67, 258, 281.
Nussbaum, 20, 66, 202, 203.

Oblique surface, 44-52, 281.
Oka, 210.
Old part, influence of, 62-65.
Oligochæta, 143.
Ontogeny, 212-215, 282.
Organization, 251, 275, 277, 278, 279, 288.
“Origin of Species,” 109.
Ovary, 124.
Oxygen, influence of, 36, 77-78.

Palla, 66.
Palolo, 143.
Paramœcium, 103.
Parypha, see Tubularia.
Pathological Regeneration, 21.
Peebles, F., hydra, 27, 56, 63, 101, 167, 168.
Peipers, 113.
Pekelharing, 118.
Pennaria tiarella, 35.
Petromyzon, 105.
Pflüger, 216, 242-243, 246, 252, 256, 264, 265, 288.
Phagocata, 104.
Phallusia mammalata, 236.
Phasmids, 154.
Phialidium variabile, 142.
Phillipeaux, 112, 200.
Phoxichilidium maxillare, 102.
Phylogeny, 212-215.
Physa, 104.
Physiological Regeneration, 19, 25, 128-131.
Pizon, 210.
Planaria lugubris, see Planarian.
Planaria maculata, see Planarian.
Planaria torva, 26.
Planarian, 9, 11, 13, 27, 28, 29, 40, 41, 43, 44-51, 64-65, 104, 107, 129, 133-135, 136, 141, 142, 201, 207, 273, 280.
Planorbis, 104.
Plants, 15, 70-91.
Plasomes, 278.
Platodes, 104.
Plethedon cinereus, 201.
Pliny, 1.
Podocoryne, 103, 168.
Podwyssozki, 113.
Poisons, 123.
Polarity, 38-40, 43, 177, 277, 280.
Polychæta, 143.
Polyclads, 104.
Polyzoa, 149.
Ponfick, 111.
Populus dilatata, 75, 76, 80.
Post generation, 20;
criticism of, 20 (footnote);
216, 219-221.
Pringsheim, 17, 86.
Proglottids, 146.
Proteus, 106.
Protozoa, 103, 145.
Przibram, 63, 100, 213.
Purpose, 282, 283.

Qualitative division of nucleus, 263.

Rabbit, 112, 113, 117, 118, 179.
Rana esculenta, 184.
Rana palustris, 185.
Rana virescens, 185.
Rand, 124, 164.
Randolph, 136, 190, 194.
Rat, 113, 179.
Rathburn, 153.
Rauber, 263-264.
Réaumur, 1;
experiments with worm and with hydra, 2;
92, 151.
Recklinghausen, 118.
Regeneration, definition of, 19-25;
incomplete, 125.
Regular Regeneration, 25.
Regulation, 22.
Remak, 208.
Reparation, 22.
Restitution, 22.
Restorative Regeneration, 25.
Rhabdocœlous, Planarians, 142, 149.
Ribbert, 112, 115, 117, 179-181.
Rievel, 190.
Roots, 80.
Rothig, 112.
Roux, definition of Regeneration, 20, 22, 183, 216-226, 243, 250, 252, 256, 288.

Sachs, 81, 88, 89;
theory of Regeneration, 265-267.
Salamander, 5, 6, 11, 43, 200, 213, 214, 270.
Salamandra maculata, 205.
Salensky, 210.
Salivary gland, 112, 113, 180.
Salix viminalis, 77.
Samuel, 118.
Sarasin, 102.
Sars, 102.
Schaper, 182.
Schmidt, O., 103.
Schmitz, 65.
Schostokowitsch, 85.
Schreiber, 106.
Schuberg, 129.
Schultz, 100, 101, 102, 154.
Schultze, 139, 225-227.
Scudder, 100, 154.
Scutigera forceps, 154.
Scyphistoma, 104, 142, 149.
Scyphozoa, 104.
Sea-urchin, 18, 19, 105.
Sea-urchin’s egg, 228.
Seeliger, 68, 210.
Self-division, 142.
Self-regulation, 22.
Semper, 93, 190.
Sertoli’s cells, 181.
Sharks, 105.
Siredon, 199.
Skin, 178, 179, 180.
Snail, 213.
Snakes, 106.
Spallanzani, Prodromo, 1, 4;
experiments with earthworms, 4;
tadpole, 5;
salamanders, 5;
snail, 5, 26, 38, 104, 153, 182, 200.
Spemann, 227.
Spencer, Herbert, 263.
Sphærechinus granularis, 68.
Spiders, 100, 104.
Spina bifida, 6.
Spleen, 124.
Sponges, 103, 142, 143, 149.
Spur of cock, 178.
Starfish, 18, 19, 102, 103, 105, 110, 144, 153, 214, 284.
Stenopus chrysops, 133, 274, 281.
Stentor, 14, 15, 56, 66, 67, 103, 129.
Stimulus, 283, 284, 285.
Stomobranchium mirabile, 142.
Stork, 97.
Strassen, zur, 189.
Stricker, 119.
Stuffs, 265-269.
Syllids, 143.
Syllis ramosa, 149.

Tadpole, 11, 45;
closing of wound, 70;
106, 137, 182-186, 197, 199-200.
Tail, 197.
Tapeworm, 143.
Tarantula, 100, 154.
Teleology, 282, 288-292.
Teleost’s egg, 237.
Temperature, 26-27, 37.
Tension, 272-278; in egg, 274.
Testes, 117, 124, 181.
Tetrastemma, 104.
Thallasicolla nucleata, 67.
Theories of Regeneration, 260.
Tornier, 54, 137, 139, 214.
Tower, 203.
Towle, 97, 201.
Townsend, 66.
Trachea, 180.
Transplantation, 179.
Trematodes, 104.
Trembley, 1;
experiments with hydra, 2, 20, 26, 38, 43, 159, 202.
Triclads, 104.
Triton cristatus, 137.
Triton eye, 112;
lens, 112.
Triton marmoratus, 106.
Tubifex, 104, 191.
Tubularia, 25, 33, 34, 52, 56-62, 69, 70, 103, 129, 167-168, 267, 273.
Turtles, 106.

Urodeles, 106, 197.

Valle, della, 210.
Vernon, 68.
Vertebræ, 181.
Verworn, 66, 67.
Virchow, 115.
Vitalism, 277, 284, 285.
Vöchting, 16, 57, 71-91, 131, 176, 269.
Vries, de, 278.
Vulpian, 182.

Wagner, von, 144, 149, 190, 192.
Wagner, W., 100.
Walter, 221.
Wax glands, 180.
Weigert, 118, 119.
Weismann, 93-96, 97, 101, 106, 108, 112, 129-130, 245, 252, 256, 261-263, 278.
Wetzel, 159, 169, 227.
White ants, 154.
Whitman, 280.
Whole embryos, of reduced size, 222.
Wiesner, 278.
Willow, 71-82.
Wilson, E. B., 68, 139, 231, 237, 250, 251, 256.
Wolff, C. F., 207, 208.
Wolff, G., 112, 203, 205, 206, 291, 292.

Zahn, 124, 178.
Ziegler, 115, 118, 119, 121, 240-241, 243, 246.
Zoja, 237.