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mass can do this for a considerable time, and if its absorption of new matter more than replaces that lost by decomposition, and if it is of such a nature as to resist the mechanical or chemical forces to which it is usually exposed, and to retain a tolerably constant form, we term it a living organism. We can conceive an organism to be so constituted, and we can further conceive that any fragments, which may be accidentally broken from it, or which may fall away when its bulk has become too great for the cohesion of all its parts, may begin to increase anew and run the same course as the parent mass. This is growth and reproduction in their simplest forms; and from such a simple beginning it is possible to conceive a series of slight modifications of composition, and of internal and external forces, which should ultimately lead to the development of more complex organisms. The LIFE of such an organism may, perhaps, be nothing added to it, but merely the name we give to the result of a balance of internal and external forces in maintaining the permanence of the form and structure of the individual. The simplest conceivable form of such life would be the dewdrop, which owes its existence to the balance between the condensation of aqueous vapour in the atmosphere and the evaporation of its substance. If either is in excess, it soon ceases to maintain an individual existence. I do not maintain that vegetative life is wholly due to such a complex balance of forces, but only that it is conceivable as such.

With CONSCIOUSNESS the case is very different. Its phenomena are not comparable with those of any kind of matter subjected to any of the known or conceivable forces of nature; and we cannot conceive a gradual transition from absolute unconsciousness to consciousness, from an unsentient organism to a sentient being. The merest rudiment of sensation or self-consciousness is infinitely removed from absolutely non-sentient or unconscious matter. We can conceive of no physical addition to, or modification of, an unconscious mass which should create consciousness; no step in the series of changes organised matter may undergo,

which should bring in sensation where there was no sensation or power of sensation at the preceding step. It is because the things are utterly incomparable and incommensurable that we can only conceive of sensation coming to matter from without, while life may be conceived as merely a specific combination and co-ordination of the matter and the forces that compose the universe, and with which we are separately acquainted. We may admit with Professor Huxley that protoplasm is the "matter of life" and the cause of organisation, but we cannot admit or conceive that protoplasm is the primary source of sensation and consciousness, or that it can ever of itself become conscious in the same way as we may perhaps conceive that it may become alive.

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INDEX.

ABRAXAS grossulariata, 119.
Acanthotritus dorsalis, 94.
Accipiter pileatus, 107.
ACREIDE, the subjects of mimicry,
85, 86.

Acronycta psi, protective colouring
of, 62.

ADAPTATION brought about by gene-
ral laws, 276; looks like design,
281.

EGERIIDE mimic Hymenoptera,
90.

AGASSIZ, or embryonic character of
ancient animals, 301.
Agnia fasciata, mimics another
Longicorn, 95.

Agriopis aprilina, protective colour-
ing of, 62.

ALCEDINIDÆ, sexual colouring and

nidification of, 240.

AMADINA, Sexual colouring and ni-
dification of, 243.
AMPELIDE, sexual colouring and
nidification of, 243.
ANCYLOTHERIUM, 300.
ANDRENIDE, 98.

Angræcum sesquipedale, 272; its
fertilization by a large moth,
275.

ANIMALS, senses and faculties of,

127; intellect of, compared with
that of savages, 341.
ANISOCERINE, 92.

ANOA, 196.

ANOPLOTHERIUM, 299.
ANTHRIBIDE, mimicry of, 94; di-
morphism in, 155.
Anthrocera filipendulæ, 120.
ANTHROPOLOGISTS, wide difference
of opinion among, as to origin
of human races, 304; conflict-
ing views of, harmonized, 321.
ANTIQUITY of man, 303, 322.
APATHUS, 98.

APPARENT exceptions to law of co-

lour and nidification, 253.
AQUATIC birds, why abundant, 32.
Araschnia prorsa, 154.
ARCHEGOSAURUS, 300.

ARCHEOPTERYX, 300.

ARCHITECTURE of most nations de-
rivative, 228; Grecian, false in
principle, 226.

ARCTIC animals, white colour of,
50, 51.

ARGYLL, Duke of, on colours of
Woodcock, 53; on mind in na-
ture, 265; criticism on Darwin's
works, 269; on humming birds
282; on creation by birth, 287.
ASILUS, 97.

ASPECTS of nature as influencing
man's development, 317.

BABIRUSA, 196.
BALANCE in nature, 42.
BARRINGTON, Hon. Daines, on song
of birds, 220.

BASILORNIS, 196.

66

BATES, Mr., first adopted the word
'mimicry," 75; his observations
on Leptalis and Heliconidæ, 82;
his paper explaining the theory
of mimicry, 83; objections to
his theory, 108; on variation,
165; on recent immigration of
Amazonian Indians, 214.
BAYMA, Mr., on "Molecular Me-
chanics," 363, 364.

BEAUTY in nature, 282; not uni-

versal, 284; of flowers useful to
them, 285; not given for its own
sake, 285.

BIRDS, possible rapid increase of,
29; numbers that die annually,
30; mimicry among, 103; dull
colour of females, 114; nidi-
fication as affecting colour of
females, 116; refusing the
gooseberry caterpillar, 119; the
highest in rank and organiza-
tion, 137; dimorphism in, 155;
why peculiar nest built by each
species, 215-219; build more per-
fect nests as they grow older,
224, 227; alter and improve
their nests, 226; sexual differ-
ences of colour in, 239.
Bombus hortorum, 90.
Bombycilla garrula, colours and
nidification of, 255.
BOMBYLIUS, 98.

BRAIN of the savage but slightly

less than that of civilized man,
336; size of, an important ele-
ment of mental power, 335; of
Savage races larger than their
needs require, 338, 343; of man

and of anthropoid apes com-
pared, 338.

BROCA, Professor Paul, on the fine

crania of the cave men, 337.
Bryophila glandifera and B. perla
protectively coloured, 63.
BUCEROTIDE, sexual colouring and
nidification of, 241.
BUCCONIDE, sexual colouring and
nidification of, 241.

BUFF-TIP moth, resembles a broken
stick, 62.

BUILDINGS of various races do not
change, 213.

BUPRESTIDE, resembling bird's
dung, 57; similar colours in
two sexes, 114.
BUTTERFLIES, value of, in studying

"natural selection," 131; varie-
ties of, in Sardinia and Isle of
Man, 178.

CACIA anthriboides, 94.
Callizona acesta, protective colour-
ing of, 59.
CALORNIS, 239.

CAPITONIDÆ, sexual colouring and
nidification of, 241.
Capnolymma stygium, 94.
CARABIDE, special protection
among, 72; similar colouring
of two sexes, 114.
CASSIDE, resemble dew drops, 58.
CATERPILLARS, mimicking a poi-

sonous snake, 99; gaudy co-
lours of, 117; various modes of
protection of, 118; gooseberry
caterpillar, 119; Mr. Jenner
Weir's observations on, 119;
Mr. A. G. Butler's observations
on, 121.

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