Part 20

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.