,
-- tremuloides,
Pores in wood,
-- small or indistinct,
-- varying in size,
Poster for private woodlands,
Precautions against fire,
Protection against fungi and insects,
Pruning forest trees,
-- lawn trees,
-- shade trees,
--, tools used in,
--, too severe,
-- trees, fundamental principles,
-- --, time for,
Pussy willow,

Quaking aspen,
Quality of trees, how to judge,
Quality of wood, how to judge,
Quercus alba,
-- palustris,
-- platanoides,
-- rubra,
-- velutina,

Red cedar,
-- -- and arbor-vitae, description of,
-- gum,
-- horsechestnut,
-- juniper,
-- maple,
-- mulberry,
-- oak,
-- pine,
-- or black oaks,
-- or sweet gum,
Red spider,
Redwood,
Removal of dead and broken branches,
-- of trees, how to mark,
Requirements of trees,
Retinospora obtusa,
Rhytisma acerinum,
Ring-porous woods,
Robinia pseudacacia,
Rock maple,
Roots,
--, development of,
--, protection of, from drying,
Rust, apple,

Safeguarding forests,
Salix babylonica,
Salix discolor,
Saperda vestita,
Sapwood,
Sawfly,
Scale, cottony-maple,
--, oyster-shell,
Scale-like leaves,
Scarlet oak,
Sciadopitys verticillata,
Scolytus quadrispinosus,
Scotch pine,
Screening trees,
Season, influence of,
Seasons for spraying trees,
Seedling trees, planting forests with,
Shade trees, pruning,
Shagbark hickory,
Shellbark hickory,
Silver maple,
-- poplar,
Soft maple,
-- pines,
"Softwoods" or conifers,
Soil erosion, forests prevent,
--, influence of, on trees,
-- of wooded areas, preserving,
--, physical character of, important for production of trees,
Soulange's magnolia,
Specifications for street tree,
Specimens of wood, how to identify,
Split trees,
Spray trees, how to,
Spraying apparatus,
-- foliage,
-- for caterpillars,
-- for fungous diseases,
-- material,
arsenate of lead,
kerosene emulsion,
lime-sulfur wash,
tobacco water,
whale-oil soap,
-- trees, seasons for,
-- trees, thoroughness essential,
Spruce and hemlock, description of,
--, black,
--, blue,
--, Oriental,
--, Norway,
--, white,
Spruces,
Star-shaped leaves,
Stem,
Stomata,
Streets, trees for,
Structure of trees,
-- of woods,
Sucking insects,
Sugarberry,
Sugar maple,
-- maple borer,
Suggestions for forming tree clubs,
-- for outdoor study of trees,
-- for planting little trees,
-- for safety of tree climbers,
-- for tree nursery,
Surface wounds,
Swamp maple,
-- white oak,
Sweet birch,
-- gum,
Sycamore,
-- maple,
--