Mountain-climbing, in the Catskills, 33-60.
Mountains, their meaning to Oriental minds, 44, 45.
Mouse, meadow, 256; crossing a lake, 309-311.
Mouse, white-footed, a mother with her young, 311.
Muskrat (_Fiber zibethicus_), 103, 104; in a doorway, 177, 178, 303.
Nature, the language of, 118; various forms of the love of, 203, 204; the real lover of, 205, 206; the passion for Nature not a mere curiosity about her, 207, 208; the creative touch of the imagination needed in descriptions of, 213, 215; fresh impressions of, 215-220; many dramas played at once on her stage, 268; all things to all men, 269, 270; the gradations in, 307-309.
Night, Jefferies on, 213; Whitman on, 213, 214; in Senancour's _Obermann_, 214, 215.
_Obermann_, by Étienne Pivert de Senancour, quotation from, 214, 215.
Observation, the gift of, 90; alertness of mind necessary in, 118, 286; a translation of nature's language into human speech necessary in, 118; on the part of wild creatures, 119; selective and detective, 208, 211; an unbiased mind necessary in, 252; specialized, 252, 253; all possible sources of error to be taken into account in, 253; a steady and patient as well as sharp eye necessary in, 262-269, 286; love of nature the first step in, 283; the critical habit of mind necessary in, 291.
Oriole, Baltimore (_Icterus galbula_), 236-238, 286; nest and eggs of, 65, 66, 124, 237, 238.
Osprey, American, _or_ fish hawk (_Pandion haliaëtus carolinensis_), regular habits of an osprey, 172, 173, 257.
Otter, American (_Lutra hudsonica_), tracks of, 303, 304; habits of, 304.
Owl, great horned (_Bubo virginianus_), 197; nest of, 61.
Owl, screech (_Megascops asio_), a brood of young, 294; notes of, 220; nest of, 61.
Phoebe-bird (_Sayornis phoebe_), 286, 293, 294; nest and eggs of, 62-64, 70, 249, 260, 297.
Pigeon, passenger (_Ectopistes migratorius_), 101; nest of, 62.
Porcupine, Canada (_Erethizon dorsatus_), 36, 37, 47, 53, 58, 309.
Prairie, the, notes from, 87-109; like the ocean, 88; life in the fifties on, 97-107; game on, 101-107; a _dead_ level, 224.
Quail, _or_ bob-white (_Colinus virginianus_), 101; setting, 136; young of, 137; answering a call, 175, 176; hatching of the young, 291, 292; notes of, 175, 176; nest and eggs of, 75, 135-137, 291, 292.