INDEX. 
297 
Stegosaur, 66. 
Stem, IV, 22 ; growth, IV, 6. 
Stone-cutters, II, 77. 
Storm-center, 125; of United States, 
129 ; predictions, 130. 
Strawberry, 267 ; wild, 268. 
Struggle, of plants in the pampas, 
253 ; species diminished by, 254 ; 
between species, 255; species, 
235 ; appearance of new species, 
284. 
Sun, 169; sun-spots, 171,177 ; total 
eclipse, 170; poles of, 171; verti¬ 
cal rays, 170. 
“ Survival of the unlike,” 257 ; of 
the “ fittest,” 256. 
Swine, II, 64. 
Tadpole, IV, 42. 
Talus, III, 100. 
Taurus, 162. 
Tea, IV, 179. 
Telegraph, III, 198. 
Terraces, 82. 
Tertiary strata, 74. 
Thermometer, III, 148. 
Thistle, I, 3. 
Tiger, American, IV, 190. 
Toad, IV, 46. 
Tomato, origin, 263; varieties, 264. 
Tools of early man, 87. 
Tramway, 51. 
Transformation, by explosion, 283. 
Transportation, evolution, 285. 
Traveling in cold region, IV, 
230. 
Trees, age of, III, 53; kinds, 1, 12, 
21, 27, 34, 51, 67; II, 33, 37, 43, 
123, 125; III, 27, 29, 33, 34, 36, 
40, 42, 49, 51, 55; variety in, 221, 
246. 
Trilobite, 36. 
Tropical scenes, IV, 145, 159,163. 
Tulip, II, 121. 
Turtle, 1, 88 ; IV, 157. 
“ Twins,” 164. 
Umbra, 175. 
Unicellular animals, 219. 
Universe of little things, 205. 
Uranus, 183. 
Use and disuse theory, 258. 
Valley building, IV, 89. 
Vanessa butterfiy, 243. 
Vapor, I, 57. 
Variation, 231 ; by food, 235; lim¬ 
ited by supply, 237; by environ¬ 
ment, 239 ; by use and disuse, 
250 ; examples of, 275. 
Variety and types in nature, 221. 
Vertebrate life, 282. 
Virgo, 166. 
Viscera, IV, 32. 
Voice, III, 133. 
Vorticella, 217. 
Walrus, IV, 247. 
Water, beneath surface, IV, 79; 
forms of, I, 55; importance, 90; 
waterspouts, 134. 
Water cress, IV, 5. 
Weather Bureau, 90. 
Weather record, 94. 
Whale, IV, 249. 
Whippoorwill, 272. 
Winds, rate of, 93; cause of move¬ 
ment of air currents, 109; pre¬ 
vailing west winds. 111: upper air 
currents, 113; Ferrel’s law of, 
116; periodical, 121; movement 
of “ low' ” center, 126 ; trade. 111; 
polar calms, 112 ; anti-trade, 119 ; 
cause of high-pressure belts, 120; 
