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Rh cipient, 118, 119; come near to attacking one, on one's approaching their nest, 121; mode of attack ineffective, 122

Gulls, Herring, fighting of, 108, 109; power of retaining a mental image, 110; curious behaviour of a pair, 110, 111; habit of forcing each other or other gulls to disgorge fish incipient, 118, 119; feed young by disgorging fish, 119, 120; disgorge fish for each other, 119, 120

variations of, more interesting than of structure, 228; may be marked in transitu, 229; plasticity of, 48

Hare, disturbing rooks, 227

Hate, oneself, a good way to, 335

Hedge-sparrow, at straw-stacks in winter, 201, 202

Heine, allusion of to the nightingale, 313

Heron, must wait a little, 337

Herring, going a progress twice, 116. Head absent in those disgorged by great skua for its young, 116, 117; possible explanations of this, 117, 118. Profusion of, brought by great skua for its young, 118

Homer, may be caught up by a butterfly, 335

Hooded Crow, flying with peewits, 27, 28; frolicking or skirmishing with raven, 137; curious antics of, 137, 138; flying with rooks, 296; consorting with rooks in the fields, 296; may sometimes roost with rooks, 296; when with rooks acts as though of the same species, 296

Hudson, Mr, views of, referred to, 79, 80, 81

importunity of female, 112

Kittiwakes, habit of forcing each other or other gulls to disgorge fish incipient, 118; will turn to bay and drive off Arctic skua, 128; roosting in extraordinary numbers, 197, 198

idea as to origin of, suggested by rooks, 288, 289

Larks (see Skylark)

Life, study of, as important as that of death, 332

Linnet, an example of sexual selection acting in two directions, 318

Lyre-bird, an example of a highly adorned species which is also musical, 334

manner of diving of, 153, 154

Meves, M., on cause of bleating in the snipe, 53

Moor-hen, becoming a partridge or plover, 48; an orchestra of peculiar brazen instruments, 57. Manner of diving of, 156, 157, 158; habit of, may be becoming established, 158; and may differ in different localities, 158. Browses grass, 227; wariness of, 226; power of drawing an inference, 227; independent spirit and originality, 227, 228

, referred to, 79, 80, 81

Nightingale, male not singing much during nest-building, 307; song of, a vehicle of hatred and rivalry, 308. Conduct of rival males, 308, 309; similar to wheatears, 308. Conduct of female during combats of rival males, 309, 310; croaking notes of, 310. Song probably founded on these, 310; which would account for its low key, 312; how differing from that of thrush, blackcap, skylark, etc., 312; does not include every excellence, 312; frequent pauses in, 312; when at its best, 313;