248 



INDEX 



National forests, 200 



Nocdle-shajied leaves, 19 



Nettle tree, 71 



Newark, N. J., 242 



Northern white cedar (arbor- 



vitaO, 22 

 Norway maple, 44, 123 



— spruce, 13 

 Nursery, tree, 132 



Oak 22G 

 — , black, 75 

 — , pin, 79, 119, 125 

 — , red, 7G, 124, 126 

 — , scarlet, 76 

 — , swamp white, 74 

 — , white, 72 

 — , yellow, 76 

 Oaks and chestnut, 71 

 Observations about trees, general, 

 235 



— and precision, child training in, 



237 

 Obtuse leaf Japanese cypress, 123 

 Opjiosite branched trees, 31 

 Orange, Osage, 105, 128 

 Oriental spruce, 122 



— sycamore, 63, 123 

 Osage orange, 105, 128 

 Ostrya virginiana, 70 

 Outdoor lesson on trees, 234 

 Oystei'-shell scale, 53 



Paper birch, 66 

 Picea canadensis, 15 



— excelsa, 13 



— mariana, 15 



— orientalis, 122 



— parryana, 15 



— pungens, 15, 123 

 Pignut hickory, 87 

 Pin oak, 79, 119, 125 

 Pine, Austrian, 9, 11, 122 

 — , Bhotan, 6, 122 



Pine, Mugho, 123 



— red, 11, 126 

 — , Scotch, 9, 11 



— trees, 1 



— weevil, white, 4 

 — , white, 122, 126 

 Pines, 224 



Pinus Austriaca, 9 



— excelsa, 6 



— mughus, 123 



— resinosa, 11, 126 



— rigida, 6 



— strobus, 4, 122, 126 



— sylvestris, 9 

 Pitch pine, 6 

 Pith, 106 



Plane or sycamore tree, 60 

 Plant lice, or aphides, 68, 152 



— study, value of, for children, 



235 



— trees, how to, 130 

 Planting forests, 179 



— forests with seedling trees, 189 



— little trees, methods of, 211 

 — , improving woodland by, 207 



— new trees, 207 



— trees, 128, 130 



most economical method, 211 



— — on land unsuitable for 



crops, 207 

 Plants, adaptation of, to seasonal 



changes, 238 

 Platanus occidentalis, 60 



— orientalis, 63, 123 

 Polyporus betulinus, 157 

 Poplar, balsam, 54 



— , Carolina, 51 



— , Lombardy or Italian, 51 



— , silver, 53 



— , tulip, 92 



■ — , white, 53 



— , yellow, 92, 231 



Populus alba, 53 



— balsamifera, 54 



