ical study. To
every one, then, science and evolution offer valuable principles of life,
but great as their service has been, their tasks are not yet completed,
and cannot be completed until the end of all knowledge and of time.

INDEX

Achatinellidae, 103, 104.

Activities, instinctive and reflex, 203, 205, 208;
of familiar animals, 208, 209;
differ from instinct, 209, 210.

Adaptation, universal relation to environment, 15;
principle of, 17;
degenerate forms enlarge our conception of, 50;
results of larval short cuts in development, 71; 109, 213.

Africa, fauna of, 103, 164, 165.

Agassiz, a believer in special creation, 98.

Ages, Palaeozoic, 92;
Mesozoic or Secondary, 93, 94;
Cenozoic or Tertiary, 93;
Coal or Carboniferous, 94.

Albumen, of egg, 60.

Alligators, a diverging branch of lizard, 45.

Amoeba, 21, 51, 69;
comparative study of, 203, 205, 231, 247, 251, 254, 257, 258, 259, 265,
266.

Amphibia, frogs, salamanders, a lower class, 45, 62;
order of evolution of, 63;
evolved from fishes, 64;
most primitive backboned animals, 92; 94, 157;
embryos of, 171; 200.

Anatomy, of mind, 202.

Ant-bears, 42.

Anthropoidea, 160.

Anthropology, 177;
methods and results of, 186;
types of, 186, 187;
comparative, of mind, 211.

Anthropometry, 177.

Ants, communities of, 125;
mental life of, 207, 208;
organizations of, 260, 263, 264.

Apes, 158;
susceptible to training, 210;
line from Amoeba, 231.

Appendix, vermiform, 168.

Apteryx, wingless bird of New Zealand, 44, 200.

Arachnida, 49.

Archaeopteryx, a famous "link," 99.

Ares, 300.

Armadillo, 42.

"Arts of life," 226-230;
dwellings of men, utensils, 227;
history of clothing, 228;
arts of pleasure, 228-230.

Atom, carbon, 22;
nitrogen, 23;
hydrogen, oxygen, 24;
chemical, 25.

Atua, 301.

Azores, animals of, 103.

Bacteria, amazing production of, 123;
relation of, 127.

Baldwin, 148.

Bandicoot, 42.

Barnacles, really crustacea, 50.

Bats, 41, 94.

"Beagle," 102, 117, 136.

Bear, 38, 39.

Bees, mental life of, 207, 208;
nervous system of, 232, 256, 257;
organizations of, 260, 261, 262;
queen, workers, 262, 263.

Beetles, 67.

Bernier, 183.

Bertillon, 183.

Birds, 44;
have they descended from gill-breathing ancestors? 61;
evolution of, 63;
primitive, 99;
embryos of, 171, 200.

Blastula, 68.

Blumenbach, 183.

B