INDEX 



IX 



School and health, H 135. 



Sclerotic, H 150. 



Scouring rush, p 203. 



Scramblers, P 129. 



Sea anemone, A 33. 



Sea fan, A 32. 



Sea horse, A 124. 



Sea urchin, A 38. 



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



Selaginella, p 204. 



Selection, natural, p 8; artificial, P 8. 



Sense, muscular, H 143; thermic, 



H 142. 



Senses of insects, A 76. 

 Sensory, cell, H 120; fiber, H 120, 



121. 



Sepal, P 133, 169. 

 Septicidal capsule, P 166. 

 Serum, H 61. 

 Sessile, P 77. 

 Setae, A 43, 48. 

 Sexual selection, A 174. 

 Shark, A 121. 

 Shelf fungus, p 194. 

 Shoes, H 48. 

 Shoulder, H 32. 

 Shrub, p 19. 

 Sick headache, H 133. 

 Sieve tubes, P 66. 

 Silicic, P 167. 

 Silique, P 167. 

 Silkworm, A 84, 86, 95. 

 Silver scale, A 83. 

 Siphon, A 101. 

 Siphonoptera, A 82. 

 Skeleton, of bird, A 152; cat, A 188; 



frog, A 131; of fish, A 113; man, 



H 28; chart of, A 218. 

 Skin, H 16. 



Skull, H 63 ; mammalian, A 194. 

 Sleep, H 130. 

 Slipper animalcule, A 13. 

 Sloth, A 199. 

 Slug, A 105. 

 Smell, H 147. 

 Snail, A 105. 

 Societies, p 9. 

 Soil, P 40, 47, A 48. 

 Soredia, p 196. 

 Sori, P 177, 192. 

 Souring of milk, H 158. 

 Spadix, p 140. 



Sparrow, A 182; English, A 170. 

 Spathe, P 138, 140. 

 Specialization, A 20, 27, 66, 210, 



H 8. 



Species, A 8. 



Spermary, A 25, 27. 



Spermatophytes, P 180. 



Spicule, A 1 8. 



Spider, A 94. 



Spike, P 157. 



Spinal cord, H 120, 121. 



Spinal deformities, H 37. 



Spine, H 31. 



Spiracle, A 77, 87. 



Spirogyra, p 184. 



Sponges, A 17, 125; glass, A 19; horny, 

 A 19; limy, A 19. 



Spontaneous combustion, xiii. 



Sporangium, p 177, 186, 188, 201, 

 203, 204. 



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



Sporophyll, p 180, 201. 



Sporophyte, P 177. 



Sports, A 148, 224. 



Sprain, H 38. 



Squash bug, A 93, 95. 



Squid, A 106. 



Stamen, p 135. 



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



Starvation, H 138. 



Stem, P 49; endogenous, P 59; exoge- 

 nous, P 6 1 ; kinds of, P 49. 



Sterilizing wounds, H 163. 



Stickleback, A 119. 



Stigma, P 135^144, 145- 



Stimulant defined, H 137. 



Stipule, P 76, 84. 



Stock, P 125. 



Stomate, P 87. 



Stone age, H 2. 



Stone fruit, P 168. 



Storage of food, P 99. 



Street cleaning, H 163. 



Struggle to live, p 4, 6, A 147, H 4. 



Study, comparative, A 82, 149, 223 



Style, P 135, 163. 



Sugar, H 91, too. 



Sulphur, vii. 



Summer-spore, p 191. 



Sun energy, p 95, A 2, H 91. 



Sunlight, A 2, H 1 8. 



Survival of fittest, p 7, A 147, H 4 

 141. 



Sutures, H 35. 



Swarm-spores, P 186. 



Sweat gland, H 20. 



Symbiosis, p 196. 



Sympathetic system, H 127, 129. 



Syngenesious, p 141. 



Synovial fluid, H 36. 



