large number of, peculiar to Celebes, 196.

ICTERIDAE, sexual colouring and nidification of, 244.

ICTHYOPTERYGIA, 298.

_Ideopsis daos_, 180.

IMITATION, the effects of, in man's works, 212.

INDIANS, how they travel through trackless forests, 207.

INSECTS, protective colouring of, 56;
mimicking species of other orders, 97;
senses of, perhaps different from ours, 202, 203.

INSTINCT, how it may be best studied, 201;
definition of, 203;
in many cases assumed without proof, 205;
if possessed by man, 206;
supposed, of Indians, 207;
supposed to be shown in the construction of birds' nests, 211.

INTELLECT of savages compared with that of animals, 341.

INTELLECTUAL power, range of, in man, 339.

_Iphias glaucippe_, 172.

ITHOMIA, mimicked by Leptalis, 83.

_Ithomia ilerdina_, mimicked by four groups of Lepidoptera, 84.

JAVA, relations of, to Sumatra and Borneo, 193.

JAMAICA swift altering position of nest, 228.

JERDON, Mr., on incubation by males in Turnix, 115.

_Kallima inachis_ and _Kallima paralekta_, wonderful resemblance of,
to leaves, 59-61.

LABYRINTHODONTIA, 298, 300.

LAKES as cases of imperfect adaptation, 278.

LANIADAE, sexual colouring and nidification of, 245.

LAMARCK'S hypothesis very different from the author's, 41.

_Larentia tripunctaria_, 63.

LAW which has regulated the introduction of new species, 5;
confirmed by geographical distribution, 9;
high organization of ancient animals consistent with, 14;
of multiplication in geometrical progression, 265;
of limited populations, 265;
of heredity, 266;
of variation, 266;
of change of physical conditions, 266;
of the equilibrium of nature, 266;
as opposed to continual interference, 268.

LAYCOCK, Dr., on law of "unconscious intelligence," 360.

LEAF BUTTERFLY, appearance and habits of, 59-61.

LEPIDOPTERA, especially subject to variation, 132.

LEPTALIS, species of mimic Heliconidae, 82;
gain a protection thereby, 259.

LESTER, Mr. J. M., on wood-dove and robin, 53.

LEVAILLANT, on formation of a nest, 224.

_Limenitis archippus_, 88.

_Limenitis limire_, 172;
_procris_, 172.

LIZARDS refusing certain moths and caterpillars, 121;
devouring bees, 121.

LOCAL FORMS, 158.

LOCAL variation of form, 169;
of colour, 173;
general remarks on, 174;