252 



INDEX 



Trees, yew, 57 



Tsuga canadensis, 17, 128 



Tulip poplar, 92 



tree, 90, 126, 231 

 Tussock moth, 143 



Ulmus americana, 47, 119, 125, 

 126 



campestris, 50 

 Umbrella pine, Japanese, 123 



tree, 100 



Value of plant study for children, 

 235 



of tree and nature study, 235 



of trees as health givers and 



moral uplifters, 237 



Walnut, 83 



, black, 87 



Wasteful lumbering, 193 



Weeping willow tree, 46, 59 



Western catalpa, 104 



Whale-oil soap, 139 



White ash, 35, 126, 227 



birch, European, 68, 120 



cedar, 24 



elm, 50 



flowering dogwood, 104 

 Whiteheart hickory, 87 

 White maple, 40 



mulberry, 105 



oak, 72 



oak, swamp, 74 



or gray birch, 64 



pine, 4, 122, 126, 



pine weevil, 4 



poplar, 53 



spruce, 15 

 Whitewood, 92, 98, 231 

 Willow, weeping, 58 

 , pussy, 59 



Wood, diffuse-porous, 221, 230 

 , diseased, disposal of, 212 



Wood, early, 220 



- fibers, 222 



, how to identify specimens, 222 

 , how to judge quality of, 233 

 , late, 220 



medullary rays, 220 



parenchyma, 222 



resin ducts, 222 

 , ring-porous, 221 



spring, 220 



, structure, of, 217 



summer, 220 

 Woodland, care of the, 203 



how to improve by removing 



trees, 211 



how to judge, unfavorable 



conditions, 203 



- trees, 126 



Woodlands, other means of pro- 

 tecting, 216 



Woodlot, small cost of well- 

 selected young trees for the, 

 208 



Wood, structure of, 217 



Wooded areas improved by plant- 

 ing new trees, 207 



areas, preserving soil of, 206 

 Woods, identification, properties 



and uses of common, 217 

 , ring-porous, 221, 226 



with large and conspicuous 



rays, 226 



with pores, 226 



with resin ducst, 224 



with small and inconspicuous 



rays, 227 



without pores, 224 



without resin ducts, 225 

 Wounds, importance of covering, 



164 



, methods of covering, 164 

 , treating surface, 168 



Xerophytes, 111 



