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388 Terns, Possible ruse of, against arctic skua, 11, 12

— Preferred as quarry by arctic skua, 13

— Excitement in colony of, on young being interfered with, 31–34

— Anger of, compared with that of insects, 31, 32

— Yahoo-like habit of, 32, 33

— Fiercer in the Shetlands than in southern England, 34

— In a mirage, 35, 36

— Mobbing hares, 32, 33

— Slight difference between common, and arctic, 34, 35

— Assaults made on author in defence of young, 39, 41, 42; beak only used in such assaults, by, 39, 41, 42; differ, in this respect, from skuas and gulls, 39–41

— Young encouraged to fly by, colony of, 42; and may need such encouragement, 42, 43

— Lethargy of young, 42, 43

— The common made roseate terns, 85

Terns, Communal interest of, in young, 179

— Possible process of social evolution in, on analogy of insects, 179–83

Theory, A soil in which facts grow, 79, 80

— Voltaire's simile in regard to, 90

United Kingdom, the, Strange summer contained in, 167

— Not mistaken by author, for paradise, 167

W

Water Wagtail, Carries many insects to young, at a time, 302

Whales, Small, off the Shetlands, 84

— Seen by author, leaping out of the sea, 84, 85

Wind, the, Difference of, in England and the Shetlands, 170, 171, 190

Wren, a, By the wild seashore, 238-40

Z

Zoologist of the future, the, 323