INDEX. 



399 



PAGE 



Vibrations of the Air 52 



Vibrations of Cords 53 



Vibrations, vary how 53 



Vibrations, velocity of 56 



Vinegar, how made 177 



Victoria Regia 232 



Violet Family 237 



Violet, hidden flowers 2:33 



Vine Family 237 



Virginia Creeper 237 



Viverridse or Civet cats 313 



Von Humboldt 12 



Volume defined 20 



Volume of irregular bodies 36 



Voices, peculiarities of 65 



Volta, Professor 93 



Volvox globater 260 



Volcano, description of 328 



Volcano, products of 329 



Volcano, causes of 329 



Volcanic Action, depth of 829 



Water, weight of 35 



Waves caused by Wind 47 



Waves or Vibrations in Air 52 



Water Wheels 68 



Waves of Light 83 



Water, composition of 110 



Water, decomposition of Ill 



Water, properties of 113 



Water a cinder 130 



\Vater in plants 188 



Water Net described 194 



Walnut Family 227 



Water Lily Family 231 



Watermelon, gourd, etc 242 



Walking Sticks, insects 280 



Water Vapor in the Air 333 



PAGE 



Water and Frost 840 



Waves, how formed 335 



Weight defined 20 



Weight, modified how 20 



Wedge defined 67 



Weathering explained . 340 



Weather, observation of 888 



" Weather saws," collect 388 



W T heel and Axle 65 



White Water Lily 231 



Whales, different kinds 308 



Winds, cause of 48 



Winds, direction of 48 



Winds explained 333 



Willow Family 227 



Wings of Insects 276 



Wind and Sand, action of 337 



Winter Birds, study of 889 



Work defined 58 



Work, formula of 58 



Work, how measured 60 



Work wasted 61 



Woods, differ how 174 



Wood, distillation of 171 



Worms or Vermes 268 



Yeast, what is it 177 



Yucca, fertilized how 247 



Yuccasella, the insect 247 



Zero, absolute 42 



Zinc, properties of 157 



Zinc, compounds of 157 



Zoology, treats of what 12, 251 



Zygnema, green scum 193 



Zygospore described 193 



Zygophyta described 195 



