ntal affection in, 135;
author's experiment in testing parental love of, 135;
use of implement (pebble anchor) by, 222.

SQUIRREL, memory in the, 70.

STENTOR POLYMORPHUS, nervous system of, 46;
observations of and experiments with, 47;
conscious determination in, 47;
ganglia of, 47.

STRONGALOGNATHUS, degeneration caused by the habit of slave-making in,
155, 156, 157.

T

TABANUS ATRATUS, balancers of, 33;
loss of equilibrium in, 33;
anatomy of balancers of, 34;
auditory hairs of, 34.

TERMES, kinds of individuals in a colony of, 161;
number of eggs laid by queen of, 162;
size of gravid queen, 162;
New Mexican, 163;
soldiers and workers of, 163;
instincts and reasoning powers of, 164.

TERRIER, love of music in, 113;
musical discrimination in, 113;
abstract ideation in, 216.

TINCTUMUTATION, definition of, 182;
location of color-changing sense centre in, 183.

TOAD, memory in the, 87;
a performing, 87;
parental affection in the Surinam, 140.

TRITICUM REPENS, sick dogs medicate themselves with, 220.

TURKEY, memory of individuals in the, 76;
recognition of property rights by the, 221.

V

VANESSA, tinctumutation in the larva of, 192.

VIPER, death-feigning in the, 207.

VOLITION, definition of conscious, 39;
physiological aspect of, 40.

W

WASP, memory in the, 62;
author's experiments in testing memory in the, 63, 69;
memory of kindred in the, 65, 69;
memory of locality and of events in the, 85;
knowledge derived from a single experience by a, 85;
length of life in the mud-dauber, 138;
evidence of reason in the mud-dauber, 149, 150;
psychic actualities of easy acquirement in the ant, the bee, and
the, 151;
faculty of computing in the mason, 169;
author's experiments in testing the computing faculty in the, 170;
method of preparing food for the male and female grubs used by the
mason, 170.

WATER-LOUSE, sense of direction in the, 194.

WREN, distress and grief evinced by, 93;
recognition of individuals by, 93;
gratitude shown by, 94.

* * * * *

ECONOMICS.

BY
EDWARD THOMAS DEVINE, Ph.D.,

_General Secretary of The Charity Organization Society of the City of
New York; Sometime Fellow in the University of Pennsylvania; and Staff
Lecturer of the American Society for the Extension of University Teaching._

* * *

16mo. Cloth. $1.0