Solomon Islands, 103.
Species, origin of human, 153.
Spencer, Herbert, 8.
Squirrels,
evolved from terrestrial rodents, 14; 41;
flying, true rodents, 41.
Starch, 24.
Stephenson, 10.
Strata, 88, 89;
arranged according to ages, 89; 90;
time of formation, 92.
Struggle for existence, 124;
intra-specific, 125;
three divisions of, 126-129; 139, 174, 175.
Substances, inorganic, 29.
Sugar, 23, 24.