Galls, 302, 401.
Galton, on transfusion in Rabbits, 166;
on heredity, 172;
on twins, 380.
Gannets, numbers collected each year, 37.
Geotropism, 398.
Germ, meaning of, 148.
Germ-cells, 73;
predisposition of the, 84, 102;
fluctuations in, 102;
not continuous, 173.
Germ-plasm, 80, 191, 266, 341, 357, 371, 403;
continuity of, 104, 168, 173, 184;
definition of, 174.
Goliathus cacicus, length of life of imago of, 47.
Goose, length of life of the wild, 37.
Götte, on necessity of death, 112;
on rejuvenescence, 115, 124;
on death of Metazoa, 125.
Gregarines, 148, 149, 202.
Grobben, on polar bodies of Cetochilus, 218.
Gruber, on regeneration amongst Infusoria, 185.
Gryllotalpa, duration of life of, 39.
Gryllus campestris, duration of life of, 39.
Häckel, on reproduction, 72;
on Perigenesis of the Plastidule, 165;
on amphigonic reproduction, 272.
Hare, length of life of, 14.
Hartlaub, on origin of germ-cells in Obelia, 208.
Hawk-moths, length of life of imago, 17.
Helicidae, length of life of, 55, 56, 57.
Heliotropism, 399.
Hemiptera, length of life of, 41.
Hens, length of life of, 36.
Hensen, on sexual reproduction, 282, 286;
on difference between germ-plasm and histogenetic nucleoplasm, 343;
on heredity, 369.
Heredity, 29, 71, 378;
defined, 72;
dependent on continuity of germ-plasm, 104, 168;
dependent on coalescence of nuclei, 178.
Hertwig, O., on fusion of nuclei, 174;
on the influence of gravity in segmentation, 177, 189;
on polar bodies, 340, 351;
on process of fertilization, 355.
Hesperornis, rudimentary wing of, 88.
Heterogeny, 325.
Heterogynis, 44.
Heteroplastides, 130, 131, 134, 139, 146, 153, 204.
Hildebrandt, on duration of life in plants, 32, 65;
on cross-fertilization, 309.
His, on heredity, 166, 390, 412;
on the transmission of mutilations, 423.
Hoek, on polar bodies in Balanus, 218.
Hoffman, on transmission of acquired characters, 407.
Homoplastides, 122, 139, 146, 202.
Horse, length of life of, 6, 7;
in the Falkland Islands, 99.
Humboldt’s Atur Parrot, 12.
Hunter, John, experiments in Anabiosis, 25.
Hyalineae, length of life of, 56.
Hybrids, 330.
Hydroids, origin of germ-cells of, 199, 206, 207, 211.
Hyla, 301, 394.
Hymenoptera, length of life of, 49.
Hypermetropia, 89.
Ichneumons, length of larval life of, 15;
length of life of imago of, 49.
Ichthyophthirius multifiliis, fission of, 148, 149.
Idioplasm, 174, 184, 192, 341;
not identical with nucleoplasm, 180;
relation to chromatin, 217;
two kinds of, 245;
various combinations of, 276.
Imago, length of life of, 16.
Immortality, injurious to species, 24;
of unicellular organisms, 25, 27, 33.
Infusoria, immortality of, 25, 72;
regeneration of lost parts in, 27, 185;
fission of, 64; encystment of, 117.
Insects, duration of life amongst, 15;
duration of larval life of, 15;
normal death of, 22;
duration of imaginal life of, 38;
segmentation of egg of, 73;
deposition of eggs, 93;
origin of germ-cells of, 202;
polar bodies of, 218.
Instinct, 83;
origin of, 91, 389;
used but once in a lifetime, 93.
Isotropism, of the ovum, 176.
Ivy, climbing shoots of, 393, 399.
Jäger, on heredity, 172, 206.
Jordan, on varieties, 269.
Julin, on spermatogenesis in Ascaris, 375.
Kallima, mimicry of, 280, 306.
Kant, on the transmission of mutilations, 423.
Karyokinesis, 359, 375.
Keim, see Germ.
Kirchner, on development of Volvox, 204.
Kölliker, on nature of spermatozoa, 175;
on embryonic cells, 196.
Lagynus, fission of, 148.
Lamarck, on use and disuse, 83, 84, 303, 387, 391, 421.
Lamellibranchiata, length of life of, 55.
Larvae, length of life of, 15.
Lasius flavus, length of life of, 50;
L. niger, 51.
Lepidoptera, length of life of imagos of, 43, 156;
parthenogenesis among, 226, 352;
spermatogenesis in, 375.
Lepisma saccharina, length of life of, 40.
Leuckart, on relation of absorbing surface to size of animal, 7;
on development of Bees, 235;
on the influence of maternal impressions on the offspring, 445.
Limnadia Hermanni, 152.
Limnaeus, length of life of, 56.
Lion, length of life of, 13.
Lister, on chromatophores of blind Frogs, 301.
Locusta, length of life of imago of, 39.
Lotze, on activity in connection with longevity, 7.
Lucanus cervus, length of life of imago of, 47.
Lycaena violacea, length of life of imago of, 44.
Lynceinae, spermatazoa of, 176.
Macroglossa stellatarum, length of life of female of, 45.
Magosphaera planula, 75, 120, 122, 126, 147, 152;
figure of, 123.
Magpies, length of life of, 36.
Mammals, duration of life of, 38.
Manx cats, 427, 430.
Maternal impressions, supposed influence on offspring, 444.
May-flies, length of larval life of, 15;
length of life of imago of, 16;
habitat of larvae of, 17;
shortening of life of, 19;
death of, 120.
Meldola, 395.
Melolontha vulgaris, see Cockchafer.
Mesozoa, 128.
Metazoa, 27, 28, 111, 145;
old age of, 157.
Metschnikoff, on pole-cells, 197.
Micellae, 190, 194.
Mimetic forms, 264, 280.
Mimosa, ‘after effects’ in, 404.
Minot, on cyclical development, 199;
on polar bodies, 214, 225, 340, 345, 353.
Moina, winter eggs of, 118, 240;
segmentation of, 199;
polar bodies of, 218.
Molluscs, length of life of, 55;
determined by markings on shell, 14;
enemies of, 58.
Monoplastides, 115, 122, 125, 146, 159;
definition of, 120;
reproduction of, 149.
Mouse, length of life of, 6; gestation of, 7.
Müller, F., on heredity of acquired characters, 320, 322.
Müller, H., on colours of flowers, 259;
on nectaries, 307.
Multicellular organisms, division of labour in, 27.
Musca domestica, length of life of, 43.
Musca vomitoria, polar bodies of, 353.
Myopia, 89.
Nägeli, 167, 171, 175;
on idioplasm, 174, 182, 190, 201, 340, 414;
on inherent tendency to vary, 256, 298;
on Alpine plants, 269;
on adaptation, 300;
on medium of heredity, 318, 355.
Najadae, length of life of, 56.
Natica heros, length of life of, 56.
Nautilus, persistence of, 300.
Nematodes, polar bodies of, 188;
nuclear division of ovum of, 234, 368.
Neuroptera, length of life of, 40.
Neuroterus, length of life of summer generation, 49;
of winter generation, 50.
Nigella, production of double flowers of, 408.
Nightingale, length of life of, 11, 36.
Nothnagel, on the cause of epilepsy, 314.
Nuclear plate, 187.
Nuclei, behaviour during fission, 118, 188;
connection of heredity with fusion of, 178;
influence of, 184;
influence in regeneration, 185;
nutrition of, 187.
Nucleoplasm, 179, 185, 191, 227;
histogenetic, 213;
ovogenetic, 213, 230, 243;
spermogenetic, 220, 243.
Nussbaum, on heredity, 172, 195, 206;
on regeneration amongst Infusoria, 185, 200.
Obelia, origin of germ-cells of, 208.
Obersteiner, on inheritance of epilepsy in guinea pigs, 311, 313.
Ophiostomum, karyokinesis in ovum of, 368.
Orgyia, 44.
Orth, on the transmission of acquired characters, 411.
Orthonectides, 120, 126;
figure of, 127;
degeneracy of, 130, 131, 141, 152.
Orthoptera, duration of life of, 39.
Ostracodes, parthenogenesis of, 294, 325;
polar bodies of, 350.
Otostoma Carteri, fission of, 148.
Palingenia, sub-imago stage of, 19, 40.
Paludinidae, length of life of, 56.
Pandorina, 202, 248;
figure of, 203.
Pangenesis, theory of, 77, 165, 166, 193, 316, 327.
Panmixia, principle of, 90, 140, 291, 430.
Papaver, production of double flowers of, 408.
Paranucleus, 376;
of the sperm-cell, 221.
Parrots, length of life of, 36.
Parthenogenesis, the origin of, 225, 290, 323, 339;
not ancestral, 228;
of bees, 235;
partial, 238;
explanation of, 243;
male, 247;
of Cynips, 273;
not perpetual, 283, 285.
Pasimachus, length of life of, 48.
Pemphigus terebinthi, length of life of, 41.
Petromyzon, impregnation of, 175, 247;
polar bodies of, 218.
Pfeffer, on chemical attraction of oosphere, 247.
Pfitzner, on nuclear division, 187.
Pflüger, on heredity, 70, 175, 355;
on the inheritance of acquired characters, 81, 390, 422;
on isotropism of the ovum, 176.
Phanerogams, fertilization of, 178, 247;
development of pollen grains of, 222.
Pheasant, the length of life of the golden, 36.
Philodina, polar bodies of, 350.
Phryganea grandis, 41.
Phylloxera vastatrix, length of life of, 41;
unequal length of life in two sexes of, 58;
parthenogenesis of, 294.
Pieris napi, length of life of, 44.
Pig, length of life of, 6.
Pigeon, length of life of, 36;
cross-breeding of, 332.
Pike, length of life of, 6.
Pisidium, length of life of, 56.
Planorbis, length of life of, 56.
Plants, duration of life of, 32, 65.
Polar bodies, 188, 218, 245;
the significance of, 212, 225, 339;
of Sponges, 217;
in parthenogenetic eggs, 249, 345, 383;
of Rabbit, 339;
number of, 346;
significance of second, 353, 362;
in plants, 377.
Pole-cells, of Diptera, 197.
Polistes gallica, ‘workers’ of, 53;
length of life of males and females, 54.
Pollen-grains, 222.
Polyphemus, spermatozoa of, 176;
summer eggs of, 239;
polar bodies of, 345.
Polyplastides, definition of, 120, 122, 125, 159;
development of, 152.
Polyzoa, length of life of, 57.
Poulton, on colours of caterpillars, 394;
on cats with supernumerary toes, 426.
Proteus, 87.
Protomyxa aurantiaca, 149.
Protozoa, development amongst, 150;
conjugation of, 287.
Psorosperms, 150.
Psychidae, length of life of, 16, 44, 45, 157;
deposition of eggs of, 18;
death of female, 63, 132;
parthenogenesis of, 293.
Pulex irritans, length of life of, 42.
Pupa, length of life of, 55.