INDEX. 399 
Seeds, Leguminous tree, 79, 86. 
Nut, 79, 86. 
Ripening in August, 78. 
Ripening in spring and early sum- 
mer, 77. 
Sources of, 73. 
Sowing, 82. 
Stratification of, 76. 
Variations from, 75. 
Seed variations, 75. 
Seed years, 63. 
Selection method, 63. 
Serviceberry, 317. 
Servicetree—Longleaf, 318. 
— Western, 318. 
Servicelree, 817. 
Shade-enduring trees, 22. 
Shagbark Hickory, 243. 
Shapes of trees, 16. 
Sheepberry, (367), 366. 
Shellbark Hickory, 248. 
Shelterbelt, 47. 
Shelterbelts, Plans of, 57. 
Shining Willow, 257. 
Shipbuilding, 166. 
Siberian Arborvite, 282. 
Silver Fir, 229. 
Silver Grain, 168. 
Silverleaf Maple, 340. 
Silver Maple, (341), 340. 
Silverleaf Poplar, 271. 
Silver Poplar, 273. 
Silver Spruce, 221. 
Size of trees, 54. 
Sleet storms, Injuries from, 108. 
Sleet storm, Trees after, 109. 
Slippery Elm, (304), 303. 
Slope, Effect on growth, 26. 
Snow crust, Injuries from, 110. 
Snowy Poplar, 271. 
Soft Maple, 340. 
Soft Maple, pruned and unpruned, 
102. 
Soil conditions, 22. 
Soil, Improvement of, in woodlands, 
18. 
Soils, Alkali, 25. 
Soils, Washing of, 24. 
Solar pit, 89. 
Sources of seeds, 73. 
Southern slope, effect on growth, 26. 
Sowing seed, 82. 
Specific gravities, Table of, 170. 
Spring frosts, Injuries from, 108. 
Spring growth of wood, 18. 
Spruce—Black, (219), 218. 
— Blue, 221. 
— Colorado Blue, 221. 
— Double, 218. 
— Douglas, (226), 225. 
— Engelmann, 221. 
-- Norway, (223), 222. 
— Silver, 221. 
— White, (217), 216. 
— White, 221. 
State bounty for tree planting, 194. 
Steel chain, 147. 
Steel tape, 147. 
Storing seeds, 78. 
Straightening streams with willows, 
162. 
Stratification, 76. 
Street trees, 92. 
Distance apart, 100. 
Kinds to plant, 100. 
Mulching, 101. 
Planting, 101. 
Protection, 103. 
Pruning, 102. 
Setting, 101. 
Success with, 100. 
Watering, 102. 
Strip method, 63. 
Subsoil, 24. 
Succession of tree growth, 60. 
Sugarberry, 306. 
Sulphite process, 180. 
Sunscald, 112. 
Small dead 
against, 70. 
Sunscalded Soft Maple and Basswood, 
(111), 111. 
Surveyor general of logs and lumber, 
144. 
Suscutanberry, 318. 
Swamp Ash, 362. 
Swamp Hickory, 245. 
Swamp Maple, 348. 
Sweet Birch, 278. 
Tables— 
Areas of circles, 136. 
Diameter growth, 143. 
twigs a protection 
