tion of, 202;
origin of, 206.

LIMPET, homing sense in, 194;
Romanes on the homing sense in, 195.

LIOTHE, fowls cleaned by, 129.

LIZARD, Ada Sterling's account of Kate Field's music-loving, 119;
fondness for music in the tree, 119;
Chilhowie "singing," 120;
author's experiment with the piccolo on, 120.

LOBSTER, love of offspring in the, 137;
battle between monkey and gravid, 137.

LOCUST, love of cleanliness in, 130;
diamond mistaken for dewdrop by, 131;
carnivorous tastes in the, 131;
description of the toilet of a, 132.

LYCOSA, love of music in, 108;
tameness of, 110.

M

MAMMOTH CAVE, eyeless spider of, 11;
eyeless fish of, 11;
homing sense in the beetles of, 196.

MANDRIL, a revengeful, 95.

MEDUSA, intoxicated, 15.

MELANOPLUS, reenforcing auditory ganglia of, 32.

MEMORY, its discussion under four heads, 60.

MIMOSA PUDICA, death-feigning by, 208.

MIMOSA STRIGILOSA, death-feigning by, 208.

MIND, definition of, 1.

MOLE, degeneration of sight organs in, 10.

MONERON, non-differentiation of nerve-cells in, 3;
nervoid elements in, 3.

MONKEY, author chosen as a friend by, 82;
a laughing, 89;
sorrow and reproach manifested by, 97;
faculty of computing in the, 177;
use of hammer by a, 222.

MORPHOLOGY, its correlation with physiology, 2.

MOUSE, love of music in, 116;
musical discrimination in, 117;
Quigley's observations, 117;
Benedick's experiments with, 117;
author's observations and analysis of the song of "singing," 118;
Ada Sterling's observations of music-loving, 118, 119.

MULE, idea of time evinced by a, 175, 176.

MYRIANIDA, eyes of, 17;
reproduction in, 18.

MYRMECA RUGINODIS, memory of friends (kindred) in, 68;
experiments with, 68.

MYRMECOCYSTUS, the honey-making, 157;
natural history of, 158;
author's experiments in testing the reasoning powers of, 158, 159;
division of labor in a colony of, 161.

N

NECTOCALYX, marginal bodies in jelly-fish's, 51.

NERVE, transmission of impressions through, 41;
the power of discrimination in, 41;
the association of ideas (impressions) in, 43;
memory in, 43.

NEWT, tinctumutation in, 186;
author's experiments with, 186.

O

OEQUOREA, eyes of, 15.

OESTRUS EQUI, selection of foreleg of horse for oviposition by, 103.

ONCHIDIUM, cephalic eyes of, 26;
dorsal eyes of, 26.

OPOSSUM, letisimulation in the, 202, 212.

ORANG-UTAN, laughter i