INDEX 



379 



Poplar, white, 283. 



Poplar, yellow (tulip-tree). See Lir- 

 iodendron tulipifera. 



Poplars, and cottonwoods, confusion 

 between, 332, 333 ; on Pacific slope, 

 851. 



Populus balsamifera (balm of Gilead), 

 3:52, 3:34, 337. 



Populus deltoides (cottonwood), 332- 

 337. 



Populus grandidentata (largetooth 

 aspen), 332. 



Populus heterophylla (swamp cotton- 

 wood), 332, 337. 



Populus ire m uloides (trembling aspen) , 

 332. 



Potash, in soil, comparative amounts 

 of, required by trees and by crops, 

 36 and n. 



Practical Forestry. See Forestry. 



Prunus serotina (black cherry), 291- 

 295. 



Prussia, revenue of national forests 

 in, IS and n. 



Pseudotsuga tarifolia (Douglas fir, or 

 Douglas spruce), 199-202; import- 

 ance of, as timber tree, 199 ; really 

 a "false hemlock," 199; its great 

 size, 200. 



Pulp. See Wood-pulp. 



Pulverizing the soil retards evapora- 

 tion, 101. 



Pure stand. See Stand, pure. 



Quarter-sawing, 86. 



Quercus acuminate (chinquapin oak), 



245, 246. 

 Quercus alba (white oak), 232-237; 



the most important of broadleaf 



trees, 232 ; methods of reproduc- 

 tion of, 235-237. 

 Quercus garryana (Garry oak), 352, 



353. 



Quercus lobata (valley white oak), 352. 

 Quercus lyrata (overcup oak), 239. 

 Quercus macrocarpa (burr oak), 241, 



242. 

 Querrus michauoni (cow, or basket 



oak), 242-244. 



Quercus minor (post oak), 244, 245. 

 Quercus pagodcefolia (Spanish oak), 



253, 254. 

 Quercus palustris (piii oak), 254- 



256. 

 Quercus platanoides (swamp white 



oak), 238, 239. 



Quercus prinus (chestnut oak), 239- 



241. 

 Quercus rubra (red oak), cut of sec- 



tion, opp. 72 ; 247-250. 

 Quercus texana (southern red oak), 



256, 257. 



Quercus tinctorium, 252. 

 Quercus velutina (black oak), 251, 252. 



Rain, methods of utilizing, 31. 



Rainfall, influence of forests on, 31. 



Range, botanical, 50 ; natural, 50. 



Redwood, may recur in second 

 growth, 18 ; 199, 228-230. 



Reforestation, success of, in France 

 and Germany, 13 ; the only hope of 

 U. S., 13, 38; defined, 16; distinc- 

 tion between natural and artificial, 

 16, 17 ; significance of varying need 

 of light in, 35 ; difficulties of, 38 ff- J 

 four classes of land on which it must 

 be effected, 38-41 ; should be begun 

 at once where forests are being re- 

 moved, 40, 41 ; mingling of species 



Reforestation, artificial, requires less 

 area to be devoted to tree-growing 

 than does natural, 18 ; various pro- 

 cesses of, 22^". 



Reforestation, natural, effect of ero- 

 sion in, 8, 9 ; described, 16 ; dis- 

 cussed, 17 ff. ; requires larger area 

 than artificial, 18 ; great uncertain- 

 ties connected with, 20; Nature's 

 method, but more likely to fail than 

 not, 20, 21 ; not to be depended on, 

 for forests of U. S., 21. 



Resin, in pines, 134 and n. ; in pitch 

 pine, 164 ; in Norway pine, 166. 



Respiration in tree-life, 69. 



Rings, annual. See Annual rings. 



Robinia pseudacacia (locust), 319- 

 322 ; the only valuable tree reason- 

 ably sure to reproduce itself by 

 sprouts, 322. 



Root, development of, in tree-life, 05, 

 6(5 ; its functions, 66, 67 ; pruning 

 of, 107, 108 ; care of, in transplant- 

 ing, 109, 111, 114. And see Tap- 

 root. 



Roumania, revenue of national forests 

 in, 18 n. 



Russia, forests in, 9 ; revenue of na- 

 tional forests in, 18 n. ; 128. 



Sap, supply of, depends on moisture, 



