Index 



221 



Pine, wasteful lumbering of, 

 12 ; yellow, io8 ; yellow, re- 

 foresting with, ICO, loi ; 

 flowers of, 208-210 



Pines and their kindred, 203- 

 216 



Pith, 138, 139; "silver grain" 

 in oak, 168 



Plant protoplasm, 124, 125 



Plum, seed, 5 



Pollen, and pollen carriers, 

 178-188 ; of the gymno- 

 sperms, 206-208 



Poplar, seed sowing, i 



Prickles and thorns, 169, 170 



"Pride of China," flowers of, 

 177 



Protoplasm, place and func- 

 tion, 194. 



Protection of the forests, 75- 

 77, 79-81 



Pruning, natural, 23, 24, 27 



Purchase areas, 72 



Quince, seed, 5 



Railroad ties, consumption of 

 wood for, 48, 49, 70 



Reforestation, 90-92 



Reserves, forest, 72-81 



Resin, 214 



Review of Forest Service In- 

 vestigations, 109 



Rings showing tree age, 167, 

 168 



Rivers, and woods, 40; fresh- 

 ets, 41, 42; earth carriers, 

 42, 43 



Root hairs, service of, 136 



Roots, feed the trees, 115; be- 

 low frost line, 115, 116; tips 

 of, and hairs, and their 

 work, 116-120, 122, 123, 125; 

 tap, 119 



Sagebrush, 200 



Sap, the ascent of, 122-123 ; 



maple, 128 -131; crude, 



mounting, 136, 137 



Sapwood of trees, 165, 166 



Sassafras, color of, 29 



Sawdust, uses for, 53 



Seed, germination of, 8 ; means 

 of travel, 3-7; protective 

 coverings, 6, 7; sowing, i-ii, 

 23 



Seeds, i-ii; winged, 3; in re- 

 forestation, 100, loi ; of 

 cone-bearing trees, 212 



Snow in the forests, 40, 41 ; 

 telling the footprints in the, 

 114; trees for protecting 

 railroads from, 11 1 



Soft woods, 215 



Spruce, 204-206, 212-214; a 

 cloud-land tree, 44, 45 ; 

 Engelmann's, io8 



Spruce gum, ,214 



Squirrels, bud eaters, 23 ; seed 

 planters, 23 



Starch, made by leaves, 196, 

 197 



Sun scalds, 27 



Sweetgum, color of, 30; cork- 

 making, 148 



Teak, durability of, 135 



" Thunder besoms," 19 



Trees, ascent of sap, 122- 

 133; blossoming, 176-189; 

 branches, a study of winter, 

 29-38; buds, 155-163; buds 

 and bud scales in winter, 

 31-35; building, 141,142; 

 cork-making of, 146-154; 

 destruction of, 53, 70; dis- 

 eases of, 13-17; falling of 

 the leaves, 153, 154; graft- 

 ing, 144, 145 ; green leaves 

 of, 190-202 ; heartwood of, 

 164, 165; knots and scars, 

 35, 26; meadow, 27; mining 

 industry use of, 49-51 ; most 

 important timber, 315 ; nat- 

 ural pruning of, 23, 24, 27 ; 

 nurseries, 100; planting, 

 103 ; protection of, necessary, 

 71 ; railroad ties require 



