, 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.

Sparrow, chipping _or_ social, nest, 53, 54.

Sparrow, song, song flight, 37;
nesting, 54;
singing, 85, 86.

Sparrow, vesper, nesting, 80-84;
its names, 82;
appearance and habits, 82, 83;
courted by a skylark, 83.

Species, origin of, an insoluble problem, 167-69, 199.

Spider, trap-door, 132-43.

Spiders, 12, 23;
genius of, 136.

Spider-webs, rainbows in, 13, 14.

Squirrel, gray, caught by a weasel, 178.

Squirrel, red, chased by a weasel, 178.

Strawberry-vines, wild, 212-14.

Struggle, 203, 204.

Sunrise, 197, 198.

Survival of the fit, 201, 203.

Swallow, bank, 78.

Swallow, barn, 71;
parental anxiety, 76, 77;
notes, 76, 77;
pleasing qualities, 77, 78.

Swallow, cliff, 77.

Swallow, tree, 78.

Swallows, feeding, 15, 16;
hibernation, 78.

Swift, chimney, 36.

Sycamore, autumn color, 3.

Taft, William Howard, 105.

Telepathy, 155.

Thistle, Canada, 202.

Thorns, the use of, 143-48.

Thrasher, brown, 67, 68.

Thrush, Alaska hermit, 129.

Thrush, hermit, song, 87.

Thrush, olive-backed, 30.

Thrush, Wilson's. _See_ Veery