248 



INDEX 



National forests, 200 



Needle-shaped leaves, 19 



Nettle tree, 71 



Newark, N. J., 242 



Northern white cedar (arbor- 



vitae), 22 

 Norway maple, 44, 123 



spruce, 13 

 Nursery, tree, 132 



Oak 226 

 , black, 75 

 , pin, 79, 119, 125 

 , red, 76, 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 

 Opposite 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 

 Oyster-shell scale, 53 



Paper birch, 66 

 Picea canadensis, 15 



excelsa, 13 



mariana, 15 



orientalis, 122 



parry ana, 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 occidentals, 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 



balsam if era, 54 



