2l6 



Index 



Squirrels, nuts of trees eaten by, 109; 



ground, as pests, 152. 

 Stone, implements of, 3. 

 Sturgeon, destructive fishing of, 167. 

 Subsoil, 64. 

 Sugar pines, '99; nuts of, eaten by 



squirrels, 109; careless cutting of, 115. 

 Swallows, insects eaten by, 199. 

 Switzerland, care of wood in, 93, 114. 

 Syria, destruction of vegetation in, 79. 



Tamarack forests, use of, 126.' 



Trees, destruction of, 12; importance of, 

 to man, 89-95 ; distribution of, in 

 United States, 96-103 ; enemies of, 

 104-1 1 1 ; the careless' wasting of, i n- 

 ii8. 



Tundras of far North, loi. 



Turpentine obtained from yellow pines, 

 93- 



Valley lands, 40, 42 ; fertility of, 53 ; 



alluvial soil in, 64. 

 Vegetation, holding of soil by, 67-72; 



results of lack of, 73-80. 



Walrus, nearly extinct, 165. 



Water, obtaining of pure, lo-i i ; home 



of, the ocean, 81 ; use and care of, 81- 



88. 

 Water creatures, need for protection of, 



162-170. . 

 Water power, use of, IS7- 

 Water supply, effect upon, of cutting of 



forests, 127-129. 

 Weasels, defense of, 193. 

 White Mountain Forest, the, 134. 

 White-pine blister, 107. 

 Wild flowers, necessity for care of, 144- 



149. 

 Wind, effect of, on soil, 65-66 ; an enemy 



of the forests, no. 

 Wood alcohol, 117. 

 Woodpeckers, usefulness of, 198. 



Yangtse-kiang, soil carried away by, 80. 

 Yellow Sea, reason for name, 80. 

 Yellowstone National Park, 140; a game 

 preserve, 204-205 ; animal life in, 205. 

 Yosemite National Park, 140. 



