Brachionus captured by, 7; uric acid crystals and sand grains in an experiment with, 9; taste in, 9; sight in, 11; memory of locality in, 49, 52; lying in wait for, and devouring the young of, a _pythium_, 49; love of pastime in, 123; death-feigning by, 201; effect of alcohol on, 219. ADELOPS, homing sense in blind, 196; author's experiments in demonstrating homing sense of blind, 196. ALBINISM, axolotl affected by, 182; difference between etiolation and, 182, 184. ALCIOPE, eyes of, 17. ALGA, stentor feeding on spores of, 47. AMOEBA, young acineta caught by, 51. ANEMONE, Romanes' experiment with, 42; death-feigning by, 205. ANERGATES, parasitic, 156, 157. ANGLEWORM, differentiation between light and darkness by, 54; experiments with light on, 55; ocelli of, 55; Darwin's theory as to deafness in, 55; organs of audition in, 56; author's experiments with, 56; conscious choice in, 56; taste in, 56, 57. ANT, memory of locality in the, 62; memory of friends (kindred) in the, 65; Huber's observations, 66; author's experiments with _Lasius niger_, 66; claviger beetles recognized and petted by, 73; gray matter in the brain of, 99; nerve-cells and nerve-filaments in the brain cortex of, 99; Lubbock's experiments (chloroform and alcohol) with, 99; sympathy evinced by, 100; parental care of worker ants for young, 103; love of amusement in the, 125; author's observations of _L. flavus_, 125, 126; _Claviger foveolatus_ fondled by, 126; Huber's observations of _pratensis_, 125; Lubbock's observations of _Beckia_, a pet of, 126; author's observations of _Podura_ in the nests of _F. fusca_ and _F. rufescens_, 126; evidence of reason in the, 152; funeral of an, 153; battle between, 153; author's verification of Huber's experiment with slave, 155; degeneration in, 155; Lubbock's summary of degeneration in, 156; homing sense in the, 197; death-feigning in the, 212.