Maeterlinck, Maurice, quoted, 23, 162; on the bee, 156-63. Man, and Darwinism, 174; a part of nature, 184-86; interpretation of nature and of himself, 186-90; mystery of his evolution, 216. Maple, sugar, susceptibility to atmospheric changes, 72, 73. Maples, autumn color, 3. Marcus Aurelius, quoted, 185. Meadowlark, song flight, 37. Measuring-worm, 91, 92. Mice, wild, 16; barking trees, 27, 28. Microphone, 170, 171. Microseisms, 170. Mind, community of, 152-55. Mockingbird, 68. Moose, 200. Mosquitoes, 210. Moth, luna, 97. Mouse, jumping, 166, 167. Mouse, white-footed, 166. Mullets, 154. Natural history about home, 39, 40. Nature, her methods unlike ours, 179-81, 199; interpreting, 186-90; lavishness and parsimony, 195, 196, 209; puzzling and contradictory, 201, 202; all-seeing, 212-14; her movements circular, 214-16. Nighthawk, 104. Nonpareil, _or_ painted bunting, 114. North Carolina, a countryman of, 121. Northern Hemisphere, 171, 172. Oak, autumn color, 3. Odd and even numbers, 163-65. Oriole, Baltimore, 30, 56; nest, 48-52, 64. Oriole, Bullock's, nest, 52. Oriole, orchard, nest, 52. Osborn, Henry Fairfield, on the origin of life, 194, 195. Ostrich, 200. Owl, screech, 45-47. Pacific Ocean, 127. Pain, 209. Pear-trees, autumn color, 1. Pelican, California brown, 131, 132. Pennsylvania, motor trip through, 109-13. Pewee, wood, nest, 52, 64; its plaint, 87. Phœbe, flight, 37; nest, 52-54, 56, 59, 60, 64, 79, 80. Pigeon, wild, 103, 104. Pine Knot, Va., visit to, 101-08. Pipit, American, 129; nest, 129, 130. Pittsburgh, 111. Plover, killdeer, 130, 131. Porcupine, 166. Rabbit, its protection, 166; caught by a weasel, 177, 178. Rainbow tints, in dew, etc., 13, 14. Rat, wood, 207 _note_. Reasons, 165-67. Redstart, 29. Road-mending, 11. Robin, young, 19; nest, 53-55, 64, 176; fear of man, 57, 58; fittest to survive, 175, 176; versatility, 176; a hustler, 176; danger of a plague of robins, 177; a runner, 177. Rocks, origin of the secondary, 200. Roosevelt, Theodore, visit to Pine Knot, Va., with, 101-08; knowledge of India, 101; opinion of Taft, 105; killing a mosquito, 105, 106; protection of the President, 106; bird-gazing, 107; letter from, 107, 108. Salamander, orange-colored, 95, 96. San Diego, Cal., 210-12. Sandstone, in the Catskills, 20. Sap, 6-8. Sapsucker, yellow-bellied, 6. Scorpion, 23. Seals, hair, in California, 148-51. Sex, the ruling, 140, 141. Shaler, Nathaniel S., quoted, 169; on the Northern and Southern Hemispheres, 171, 172. Shrew, 16. Skunk, 206-08. Snakes, 11. Sources, original, 190, 191. South, characteristics of the, 120, 121. Southern Hemisphere, 171, 172. Sparrow, story of a nest, 98, 99.