Myrrh, what it is, whence obtained, and uses of, 262 Myrtle common, description and use of, 137 N. Nankeen dye (Scot's), of what made, 157 Nectarine, 140 Nettle, common, leaves, tops, stalks, roots, flowers, and seed, uses of, 213, 214 Nettle stings, description of, 214 Nightshade, deadly, description, injurious effects, and uses of, 53, 54 Nutmeg tree, description of, 244 Nutmegs, how gathered and prepared for use, and uses of, 245 Nut-oil, from what prepared, 228 Nux vomica, description and uses of, 58 O. Oak tree, wood, bark, saw-dust, and acorns, uses of, 222-225 Oatmeal, uses of, 24 Oats, mode of cultivation and uses of, 24 Oil-cake, of what made, and uses of, 87, 174 Olive tree, description and uses of, 11, 12 ---- oil, how prepared and uses of, 11 Olives, how prepared for use, and uses of, 11 Onion, Canadian or tree, description and uses of, 90 ----, common, description and uses of, 91 ----, Portugal and Spanish, 91 Opium, how obtained, properties and uses of, 154, 155 ----, how cultivated in England, 155 ----, how adulterated, 154 Orange, flowers, juice and peel, uses of, 194, 195 ----, Seville or bitter, 195 Orchall, description, preparation, and use of, 270 Orders of plants, 4 Orenberg gum, of what made, 237 Orris root, description and uses of, 17 Osier, wood and bark, uses of, 243 Ottar of roses, from what made and how adulterated, 150 Owler. See Alder.