Neon, in atmosphere, i, 11, 12; production and use, i, 33; symbol and atomic weight, viii, 383 Neotomy, xii, 173 Nephoscope, i, 86, 377 Neptune (planet), ii, 268-9; atmosphere, 250; comet families, 271; discovery, 67, 79, 86, 189, 268, 272; distance from sun, iii, 159; habitability, ii, 250; orbit, 270, 163; photographic study, 133; planets beyond, 270-3; retrograding motion, 271; size, 163; rotation period, 377; weight, 77 Nerve Cells, functions and structure, ix, 122-4, 125; growth of, 48; of brain, 140 (see also Connective, Motor and Sensory Nerve Cells) Nerve Centers, of brain stem, ix, 168, 257 Nerves, color effects, vi, 274-5; at birth, ix, 348-9; composition and color, 124, 159-60, xi, 17; cranial, 29-31 (see Cranial Nerves), ix, 131, 132; distribution to muscles, 124-5, 127; electrical excitation, vi, 63-4; spinal, ix, 131-2, xi, 25-6; to glands and smooth muscles, ix, 159-60, 162, 164-5 (see also Nerve Cells, Neurones) Nerve Trunks, ix, 131-2 Nervous Actions, complex, ix, 139-54; simple, 132-7; special, 155-72 Nervous Activity, fundamental laws, xi, 18-23, 27-8 Nervous Diseases, electrical treatment, vi, 17, 63-4, 284-5; electrical treatment, vii, 235, 238-9; habit in, xi, 248; hot baths in, x, 311; physical attendants, 353; physical causes, xi, 370-2; suppressed emotions and, 140 Nervous Fatigue, ix, 137-8 Nervous Fluid Theory, x, 85-6 Nervous Prostration, x, 248 Nervous System, xi, 16-32, ix, 122-38; brain connections in, ix, 142-4, 147-51; complexity and mental activity, xi, 13, 20; control of body functions by, x, 346-7, 352-3; control of glands and smooth muscles by, ix, 159-60, 162-3, 164-5, 168; development in embryo, 343, 344, 348-9, xi, 34-6; emergency effects on, ix, 166-7, 171; examination methods, x, 371; fatigue effects, xi, 272, 274; function (Crile), 58; functional unit, 20; habit in, 248; hereditary diseases of, x, 234; in sleep, xi, 286-8; part of, in maintaining life, ix, 20, 21, 23; reciprocal innervation in, xi, 86; sympathetic, x, 352-3, xi, 134-5; thyroid effects on, ix, 303, 304 (see also Central Nervous System) Net Goods, v, 277 Netherlands, delta formation of, xiv, 186 Nettle, hairs of, xiii, 42 Net-veined Leaves, xiii, 32, 34, 176, 178, 183 (fig.); classification of plants with, 60-1 Networks, electric, vii, 27, 373 Neuralgia, barometric effects, i, 329 Neurasthenic Abscess, Amatus' cure of, x, 58-9 Neurones, xi, 17-18, 20-1, 22 (see also Nerve Cells) Neurotomes, xi, 34, 35 Neutral Coasts, xiv, 248, 254, 263-4 Nevada, mining products, iii, 366, 368, 370; "pogonip" fogs, i, 96; rainfall, 112; silver mines, viii, 198; topography, xiv, 42 Névé, granulated snow, iii, 59