Hackberry tree,
Hackmatack,
Hard maple,
—­ pines,
“Hardwoods,” or broadleaf trees,
Hardy catalpa,
Harvesting forests,
Harvesting of forests to increase production,
Hawthorn, English,
Healthy tree, conditions which indicate,
Heartwood,
Heat, effect of, on trees,
Hemlock,
—­ and spruce, description of,
Hickory,
—­ bark borer,
—­, bigbud,
—­, bitternut,
—­, broom,
—­, brown,
—­, mockernut,
—­, pignut,
—­, shagbark,
—­, shellbark,
—­, whiteheart,
Hicoria alba,
—­ glabra,
—­ minima,
—­ ovata,
Honey locust,
Hop hornbeam,
Hornbeam, (blue beech),
Horsechestnut,
—­, red,
Humus,
Hydrophytes,

Important insects,
Improperly pruned trees,
Indian bean,
Individuality of trees,
Insects and fungi, protection against,
—­, boring,
—­, chewing,
—­ galls,
—­, important kinds of,
—­ injurious to trees,
—­, leaf-eating,
—­, methods of destroying injurious,
—­, nature, habits and influences of,
—­, sucking,
—­, the four stages, or life history of,
Ironwood tree,
Italian or Lombardy poplar,

Japanese maple,
—­ umbrella pine,
Juglans cinerea,
—­ nigra,
Juniper,
Juniperus communis,
Juniperus virginiana,

Kerosene emulsion,
Knees, cypress,

Larch, American,
—­ and cypress, description of,
—­ European,
Large-toothed aspen,
Larix europaea,
Lawn and grove, study of soil conditions on,
Lawn trees,
—­ —­, pruning,
Leaf blotches,
Leaf-eating caterpillars,
——­, insect,
Leaves,
—­, needle-shaped,
—­, scale-like,
—­, star-shaped,
Lenticels,
Leopard moth,
Lesson on trees, outdoor,
Light, influence of, on trees,
Limbs, various methods of bracing,
Lime-sulphur wash,
Lime-tree,
Linden, American,
—­ borer,
—­, European,
Liquidambar styraciflua,
Liriodendron, tulipifers,
Location of trees, care to be exercised in,
Locust,
—­, black,
—­ borer,
—­, common,
—­, honey,
—­ miner,
—­, yellow,
Lombardy or Italian poplar,
Low juniper,

Magnolia acuminata, —­, mountain, —­ soulangeana, —­, Soulange’s, —­ tripetala, Magnolias, the, Maiden-hair fern, —­ or gingko tree, Maple wood, —­, ash-leaf, —­, hard, —­, Japanese, —­, Norway, —­ phenacoccus, —­, red, —­, rock, —­, silver, —­, soft, —­ sugar, —­ swamp, —­, sycamore, —­, white, Mesophytes, Method of covering wounds, Methods of destroying injurious insects, Mockernut hickory, Moisture a factor in developing disease, —­, influence of, on trees, Moral influence of trees, Morus alba, —­ rubra, Moth, gipsy, —­, leopard, Mountain magnolia, Mugho pine, Mulberry, red, —­, white,

National forests,
Needle-shaped leaves,
Nettle tree,
Newark, N.J.,
Northern white cedar (arbor-vitae),
Norway maple,
—­ spruce,
Nursery, tree,