Aduco, Dr., 23-25.

Alcohol, effect of, on jellyfish, 54.
on water flea, 56.

on cress plant, 56.
on dogs, 57.

on students, 58.

on typesetters, 60.

on soldiers, 61, 63.

during cholera epidemic, 100.
relation of, to hydrophobia, 101.
effect of, on phagocytes, 101-103,
106.

on Bum and Tipsy, 102.
use of, in pneumonia, 104.
percentage of, in common drinks,
106.

crimes under influence of, 206.
cells affected by, 207.
growth of desire for, 211, 212.
used by school children, 227, 228.
effect of, on children through par-
ents, 229, 230, 232–236.

Amoeba, where found, 39.

changing shape, 39.
capturing food, 40.

method of multiplication, 42.
Amphioxus, description of, 45.

its structure, 46.

development of, from egg, 47, 48.
why called vertebrate, 51.
work done by its nerves, 52.
Aschaffenburg, Dr., experiments with
typesetters, 60, 61.

Attention, why valuable, 186.

effect of, on neurons, 187.

Attention, how increase power of, 196,

197.

how interfered with, 197, 198.
as aid to success, 199-201.
controlled by will, 202.
Axons, 67, 68, 70, 73.

through spinal cord, 79.
termination of, in muscle, 80.
how rendered useless, 81, 82.
uniting the ganglia, 133, 134.

Backbone, in amphioxus, 46, 51, 53.
protection for neurons, 69.
how formed, 71.

Balance board, explanation of, 20.
Bayer, Dr., 227.
Bee, brain of, 109.

Bertino, accident recorded, 16.

history of experiments with brain
of, 17.

Bicycle race, effect of, on eyesight, 35.
Birds, the study of, 159, 160.

Blood supply, laws of, to brain, 18.
Blood, why valuable, 21.

how improved, 21.

Brain, description of, 10.
divisions of, II.
how studied, 13.

relation of, to skull, 13.

causes of increased blood supply
to, 17.

studied by experiments on Bertino,

16, 20.

condition of, during sleep, 18.

exercise of, 20.

in monkeys, 192, 193.

fatigue of, 25.

Brain, effect of brain work on muscular

power, 27.

method of rest of, 27-29.

of pigeons after flight, 35.
relation of, to muscular work, 36,
37.

relation of, to cord, 71.

value of its white and gray sub-

stance, 73.

different sizes of, 74.
of sparrow, 107.

of bee, tested, 109.
during sleep, 123.

how to drive blood from, 124, 125.
condition of, during a faint, 130.
on receipt of stimulus, 167.
disclosures of, after death, 168.
of Laura Bridgman, 170.
one part joined to another, 173.
how improved in quality, 173, 178.
paths developed in, 174.

effect of noise on, 198.
affected by alcohol, 212.
Bridgman, Laura, 156-158.

brain of, after death, 170.
Brunton, Sir Lander, 151.

Bum and Tipsy, during epidemic, 102.
Buster, choosing, 191.

Carpenter, Dr., 135, 155, 161, 185, 215,
237.

Cells, single-celled and many-celled ani-
mals defined, 44, 49.
methods of multiplication, 47.
arrangement of, in layers, 49, 50.
poisoned by alcohol, 54, 63.
of nervous system, 66.

center of activity, 70.

changed by work, 110.
how marked, 186.

affected by alcohol, 207, 208, 210.
Chickens, affected by alcohol, 56.
China, prohibition of opium trade, 203,

204.

fatigue of, shown in birds, 108-110.
similarity of, in all animals, 110.
when tired, 112.

condition of, during sleep, 126, 127.
issuing commands, 129.

power of one set over another set,
135, 136.

affected by emotions, 137–139.
how governed, 142, 143.
supplementing each other, 164.
different reports from, 165.
permanent number, 172.
how connected, 174.

power to remember, 182.

when rested, 184.

how to mark them, 185.

influence of attention on, 185.

work of, hindered by noise, 197, 198.
affected by alcohol, 210-212.
helped through habit, 221.
learning quickly, 222.

affected by suggestion, 241, 242.
Nicotine, 150.

Noise, why objectionable at night, 20.
Norway, idiocy as related to alcohol,

229, 230.

Nucleus, affected by work, 110.