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 School and health, 135.

Sclerotic, 150.

Scouring rush, 203.

Scramblers, 129.

Sea anemone, 33.

Sea fan, 32.

Sea horse, 124.

Sea urchin, 38.

Seed, 20, 163, 180; coat, 21.

Selaginella, 204.

Selection, natural, 8; artificial, 8.

Sense, muscular, 143; thermic, 142.

Senses of insects, 76.

Sensory, cell, 120; fiber, 120, 121.

Sepal, 133, 169.

Septicidal capsule, 166.

Serum, 61.

Sessile, 77.

Setæ, 43, 48.

Sexual selection, 174.

Shark, 121.

Shelf fungus, 194.

Shoes, 48.

Shoulder, 32.

Shrub, 19.

Sick headache, 133.

Sieve tubes, 66.

Silicle, 167.

Silique, 167.

Silkworm, 84, 86, 95.

Silver scale, 83.

Siphon, 101.

Siphonoptera, 82.

Skeleton, of bird, 152; cat, 188; frog, 131; of fish, 113; man, 28; chart of, 218.

Skin, 16.

Skull, 63; mammalian, 194.

Sleep, 130.

Slipper animalcule, 13.

Sloth, 199.

Slug, 105.

Smell, 147.

Snail, 105.

Societies, 9.

Soil, 40, 47,  48.

Soredia, 196.

Sori, 177, 192.

Souring of milk, 158.

Spadix, 140.

Sparrow, 182; English, 170.

Spathe, 138, 140.

Specialization, 20, 27, 66, 210,  8.

Species, 8.

Spermary, 25, 27.

Spermatophytes, 180.

Spicule, 18.

Spider, 94.

Spike, 157.

Spinal cord, 120, 121.

Spinal deformities, 37.

Spine, 31.

Spiracle, 77, 87.

Spirogyra, 184.

Sponges, 17, 125; glass, 19; horny, 19; limy, 19.

Spontaneous combustion, xiii.

Sporangium, 177, 186, 188, 201, 203, 204.

Spore, 176, 178, 181, 184,  159.

Sporophyll, 180, 201.

Sporophyte, 177.

Sports, 148, 224.

Sprain, 38.

Squash bug, 93, 95.

Squid, 106.

Stamen, 135.

Starch, x, 95, 101,  88, 91.

Starvation, 138.

Stem, 49; endogenous, 59; exogenous, 61; kinds of, 49.

Sterilizing wounds, 163.

Stickleback, 119.

Stigma, 135, 144, 145.

Stimulant defined, 137.

Stipule, 76, 84.

Stock, 125.

Stomate, 87.

Stone age, 2.

Stone fruit, 168.

Storage of food, 99.

Street cleaning, 163

Struggle to live, 4, 6,  147,  4

Study, comparative, 82, 149, 223

Style, 135, 163.

Sugar, 91, 100.

Sulphur, vii.

Summer-spore, 191.

Sun energy, 95,  2,  91.

Sunlight, 2, 18.

Survival of fittest, 7,  147,  4, 141.

Sutures, 35.

Swarm-spores, 186.

Sweat gland, 20.

Symbiosis, 196.

Sympathetic system, 127, 129.

Syngenesious, 141.

Synovial fluid, 36.