Hipparion, 109, 151.

Homogeny, 180.

Homology, bilateral or lateral, 177,
185.

Homology, meaning of term, 8, 177.
Homology, serial, 181.
Homology, vertical, 185.

Homoplasy, 181.
Honey-suckers, 102.
Hood of cobra, 56.

Hook-billed ducks, 113.
Hooker, Dr., 170.
Horned flies, 105.
Horny plates, 45-47.
Horny stomach, 92.
Human larynx, 61, 320.
Humphry, Professor, 184, 270.
Hutton, Mr. R. Holt, 227, 229.
Huxley, Professor, 76-78, 80, 82, 83,
106, 117, 123, 148, 153, 154, 159,
184, 194, 264, 283, 314.

Hybrids, mortality of, 140.
Hydrocyonina, 166.
Hyperphysical action, 291.

Hyrax, 201.

Magnificent Bird of Paradise, 104.
Maize, American, 113.
Mammals, 76.

Mammary gland of kangaroo, 48.
Mammary gland, origin of, 53.
Man, origin of, 319.

Man reveals God, 307.
Man, voice of, 61.
Manatee, 46, 197.

Manchamp breed of sheep, 113.
Manis, 196.

Man's larynx, 61, 320.

Many simultaneous modifications, 64.
Marcus Aurelius, 235.

Martineau, Mr. James, 225, 281.
Mastacembelus, 165.

Materially moral acts, 220.

Matter, crystalline and colloidal, 306.
Meaning of word "individual," 2.
Meaning of word "species," 2.
Mechanical theory of spine, 185.
Mediterranean oyster, 99, 110.
Meehan, Mr., 99.

Mexico, dogs in, 111.

Mill, John Stuart, 18, 212, 218, 219.
Mimicry, 9, 33.

Miracle, 331.

Molars, 124.

Mole, 199.

Molière, 263.

Mombas, cats at, 110.

Monkeys, American, 258.
Monster proboscis, 139.
Moral acts, 220.

Mordacia, 166.

Murphy, Mr. J. J., 58, 60, 86, 116,
128, 129, 155, 208, 252, 318, 323.
Murray, Mr. Andrew, 93.

Mus delicatulus, 93.

Muscles of limbs, 201.

Musical harmony, 60, 322,
Mussel, 89.

Myrmecophaga, 92.

Pavo nigripennis, 113.

Peacock, black shouldered, 113.
Peacock, inflexibility of, 134.
Pedicellariæ, 49.

Pelvis, diseased, 205.

Pendulous appendages of turkey, 113.
Perameles, 77.

Periophthalmus, 165.

Perissodactyle ungulates, 123.

Permian, jugular fish, 159.

Perodicticus, 118, 201.
Phalangers, 76.

Phasmida, 101.

Phyllopods, 89.

Physical actions, 291.

Physiological units," 189, 248.
Pigeons' "boots," 203.
Placental mammals, 76.
Placental reproduction, 76, 91.
Plants, tendrils of, 121.
Plates of baleen, 45.
Platypus, 196.

Pleiades, 217.

Plesiosaurus, 120, 149, 201.

Pleurodont dentition, 167.

Pleuronectidæ, 41, 186.

Plotosus, 166.

Poisoning apparatus, 74.

Poisonous serpents, 56.

Polarities, organic, 207, 208.

Political economy, Fuegian, 216.

Polyzoa, 91.

Pompadour, Madame de, 233.
Poppy, variety of, 114.
Porcupine, 197.

Porto Santo rabbit, 113, 137.

Potto, 118, 201.

Pouched beasts, 76.

Powell, the Rev. Baden, 296, 298,

301, 329.

Premolars, 124.

Prepotency, 140.

Primary intuitions, 289, 332.

Primitive man, 231.

Problem of origin of kinds, 1.

Proboscis monkey, 156.

Proboscis of ungulates, 139.

Processes, bird's-head, 91.

Psettus, 165.

Psoriasis, 205.

Q.

QUASI-VERTEBRAL theory of skull, 194.

R.

RABBIT of Porto Santo, 113, 137.
Radial ossicle, 199.

Rarefied air, effect on dogs, 111.
Rattlesnake, 56.

Red Bird of Paradise, 103.
Relations, analogical, 178.
Relations, homological, 177.
Reptiles compared with birds, 79.
Retina, 86.

Retrieving, virtue a kind of, 213, 232.
Reversion, cases of, 137.
Rhea, 79.

Ribs of Cetacea and Sirenia, 46.
Ribs of flying-dragon, 73, 178.
Richardson's figures of pigs, 112.
Roger Bacon, 305.

Rudimentary structures, 8, 116.

Sharks, 92.

Shell-fish, beauty of, 61.
Shells of oysters, 99, 110.
Shielded grasshopper, 100.
Silurian strata, 158, 160.
Simultaneous modifications, 64.
Sirenia, 47.

Sir John Lubbock, 225, 291.
Sir William Thomson, 153.
Sitaris, 52.

Six-shafted Bird of Paradise, 101.
Skull bones, 173.

Skull segments, 194.

Sloth, windpipe of, 92.

Smithfield, wife-selling in, 224.
Snow, crystals of, 210.
Sole, 41, 187.
Solenodon, 168.

Species, meaning of word, 2.
Spelerpes, 186.

Spencer, see Herbert Spencer.
Spider orchid, 62.
Spiders, flight of, 74.
Spine of Glyptodon, 124.
Spine, segmentation of, 193.
Squalidæ, 43.

Squilla, 182.

Sterility of hybrids, 139.
Stings, 74.

Straining action of baleen, 46.

Struthious birds, 79, 171.
Sturgeon, 193.

Suarez, 21, 305.

Substantial forms, 210, 213.

Sufferings of beasts, 299.
Supernatural action, 291.

Supernatural action not to be looked
for in nature, 17.

Supernumerary digits, 138, 202.
Syllis, 190, 241.

Symbolic conceptions, 288.
Symmetrical diseases, 205.
Syphilitic deposits, 205.

T.

TADPOLE'S beak, 92.
Tania echinococcus, 191.
Tails of butterflies, 94, 96.
Tapir, 139, 151.

Tarsal bones, 179.

Teeth of Cetacea, 92.

Teeth of Insectivora, 77.

Teeth of kangaroo and Macroscelides,
77.