Sequence, physiological, in training animals, 209; 210.
Series,
sedimentary, 84, 90, 92;
crystalline or plutonic, 85;
Azoic or Archaean, age of, 92.
Shale, 89.
Shark,
common, most fundamental form, 46;
embryo of, hammerhead;
embryos of, 66.
Sheep, 157.
Simiidae, 160, 163.
Skate, embryos of, 66.
Snails, 45;
shells of, 95;
land snails, 103;
Hawaiian and Polynesian, 104.
Society Islands, 103.
Solar system, origin of, 84.
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.
Survival of the fittest, 129.
Systems,
respiratory, excretory, circulatory, 17;
organic, reproductive, 18;
nervous, 256, 257;
blood-vascular, respiratory and excretory, 257;
ethical, 286;
religious, 288.
Tadpole, 58, 59, 60;
larvae, 64.
Tapeworm, a relative of simple worms, 50; 123.
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