parthenogenetic powers possessed
by certain, 330, 331

poisonous, methods of self-protec-
tion used by, IOI

'warning coloration
sessed by, 107

pos-

propagation of, 132-137, 144-145,
329-330

sleep of, salient features connected
with, 161-164

structure of multicellular and uni-
cellular, comparisons be-
tween, 207-208

unicellular, uses made of cilia by,
194-197, 207

wild, congenital defects less ob-
vious in, 271, 272
wood-boring, 346, 347

Anopheles Gnat, 3
Ants, aphides

and,

Aphides-

between, 324, 325

friendship

enemies of, 319, 325
hop-blight caused by species of,
317, 319

parthenogenetic propagation of,
326-327, 330, 334, 336
rapid propagation of, 326, 338
relationship of Coccida to, 322,
323

secretive productions of, 323-325
various species of, 322
Archæology, discoveries in connection
with pre-historic man, 371-
372, 391, 394-395, 398, 400,
402

Art, knowledge compatible with, 45
Astronomers, stupendous nature of
work, 224

connection with, 226

Bacteria, destructive invasion made
by, 340

microscopic observation of, im-
provement in, 239

Balfour, Rt. Hon. Arthur, speech at
Manchester by, 6, 7 (quota-
tion)
Bananas, cultivated varieties of, 369
plantains and, identity of, 368
Bayeux tapestry, 231

Becquerel, M., experiments of, 183
Beetles, book-worm, depredations
of, 350-351

death-watch, tapping made by,
351, 352

wood-boring, 351, 352
wood-boring, 349-350

ladybird, beneficial activity of,
319, 325, 326
origin of name, 325
perforation of soft metal by grubs
of, 353
Bell-animalcules, 197
Birth-rate, increased, amongst
poorer classes, 285, 286
Blood, lack of red colour in, cause
of, 148, 149

red-coloured, cause and special
duty of, 148

Bonaparte, Prince Roland, French
representative at Darwin
Centenary Celebration, 39

Book-worm beetle, 350
Boulenger, Charles, Egyptian fresh-
water jelly-fish described by,
64

spun by, 294, 295

Caddis-worms, movable cases made
by grubs of, 343

Calandruccio, discovery of young of
the eel by, 71-72

Cambridge-Darwin Centenary Cele-
bration, Address by Sir Ray
Lankester at, 33-37

held at, 18, 33, 38

notable representatives at, 33,
38, 39.

Cave-men, ancient, artistic skill of,
80, 81

horse mastered and muzzled by,
80, 81

Caves, care taken in excavation of,
388

discoveries of human remains in
deposits of, 371, 374, 383,

393, 395, 402, 407-409
discovery of bones of ancient men
in, rarity of, 372-374
French and English, evidences of
human occupation found in,
78-79

Cells, definition and origin of term,
170-173, 328

66

egg-cell, process of fertilisation,
202-204, 330, 332
important part played by nucleus
in life of, 198-200, 328,
329.

individual character and CO-
ordinated activity of, 170,
180-182, 184, 328

process of division, 200-202, 328
Cell-theory," explanation of Pro-
fessor Schwann's, 174-176
Chapelle-aux - Saints, discovery at,
important, 371, 374, 390,

due to panic caused by, 239
date of first appearance
England, 238

diffusion through water-supply,
239

discovery by Koch of bacillus
producing, 240
epidemic nature of, 238
Europeans first attacked by, 238
recognition of, by Hindu writers,
238

precautions to be observed for
prevention of, 244, 245, 246
Cholera-bacillus. See Cholera
Christmas fare, origin of, 356-358
Cilia, animals provided with, and
action of, 194, 195, 207

definition of term, 194

uses made of, by unicellular
animals, 195-197, 207
Cirrhipedes," Darwin's discovery
with regard to, 23, 24
Civilisation, scientific knowledge as
affecting, 16

Clothes moths, 341

Coccida, relationship of aphides to,
323

Colour, in bird's feathers, 55, 56
nature and properties of light as
affecting, 52-55

Comets, ancient records of, exaggera-
tion in, 227, 229

composition of, 234, 235
Donati's, imposing size of, 227
early superstitions with regard to,
227, 228

elliptical orbits of, 233
Halley's-Chinese astronomical ob-
servations relating to an-
tiquity of, 230
length and breadth of orbit, 233
length of tail, 227

Comets—continued.

Halley's-continued.

predicted recurrences by dis-
coverer of, 226, 230

recent appearance of, 226, 230,
236

significance of date of return,
228, 229

superstition and consternation
caused by, 230, 231

William the Conqueror's "star,"
identical with, 231

important, various, 227

Milton's reference in Paradise
Lost to, 228, 229

periodic and wandering, distinction
between, 233, 234

photographs obtained at Royal
Observatory, Greenwich, of
new, 225, 226

shooting stars and, connection
between, 235, 236

signification of name, 227

superstitions with regard to, 229
Corrèze skull, 371

Cromagnards, designation of Reindeer
men as, reason for, 390

Cuba, measures adopted for prevention
of yellow fever and malaria
in, 2, 3

Darwin Centenary Celebration at
Cambridge, 18, 33, 38

Darwin, Charles-

comparison between theories of
Lamarck and, 19, 20

connection with University of
Cambridge, 36

establishment of "natural selec-
tion" theory, 34

extent of time spent in experi-
ments and observations, 18-
19, 22-23

friendly relations between Wallace
and, 13, 37

geological discoveries of, 24
Henslow's influence upon, 36
"Natural selection 22 theory ex-
plained, 27-29

study of disease influenced by
discoveries and research of,
39, 40
Darwinism (Wallace), 15, 16 (quota-
tion)

Death-rate, diminished, reasons ac-

countable for, 284, 285

health of locality determined by,
283

records of, methods of keeping,
283, 284

Death-watch beetle, 351, 352
De Lastic, Vicomte, carvings from
caves in collection of, 79
Dewar, Sir James, experiments of,
183
Divers, Mediterranean, suggested in-
halation of pure oxygen gas
by, 261
Diving, Fleuss apparatus, diluted
oxygen supply to, 263-265
Donati's comet, 227
Dragon, heraldic, description of,
114, 115

Dragons, classification of, by heralds,

120

conventional, probable sources of,
126

probable origin, 121-123

snakes and, connection between,
120-123
tradition of, reasons for discrediting
suggested, 118-120

Drugs, individual variability (idiosyn-
crasy) with regard to, 102

Eau-de-Cologne, volatile oils from

aromatic plants of Riviera
used in manufacturing, 47
'Eel-fare,' term for annual "run-
ning up" of young eels, 67,
70, 73, 75

Eel-fisheries, regulation and en-
couragement by Danish
Government of inland, 65
German Government of inland,
65, 66
Eels, age of, knowledge resulting
from power of telling, 69
shown by scales, 69

common, period when change from
"yellow" to "silver" takes
place in, 67, 69, 70
reproduction, migrations
habits of, 66-67, 69-76
"leptocephalus - young - phase"
tadpole of, 71-73, 75
migrations of, geological changes
as affecting, 74

and

or

Eels-continued

Petersen's researches with regard
to "silver," 68, 69
popularity of, abroad, 65, 66
rare Occurrence of, in river
Danube, 74, 75

"Elvers," term for young eels, 66,
67, 70, 71, 73, 75, 76
Europe, iron, stone, and bronze ages
of, 375-377

Evelyn, diary of, 229 (quotations)

Feeble-minded, distinctions between
lunatics and, 274-276

laws relating to lunatics and, need
for improvement in, 275
necessity for state guardianship of,
276-278

Feeble-minded children, 278
Feeble-mindedness,

sug.

atavism
gested cause of, 274
hereditary transmission of, 277
occurrence of cases in all classes of
community, 276

views of Government Commission
on origin of, 281
Festivals, Christmas, origin of chil-
dren's customs associated
with, 361-362

English Christmas, introduction of
turkey in connection with,
358

origin of heavy feeding at, 357
prehistoric and barbaric customs
in connection with, 356-357
Fever, yellow, comparative death-
rate from, in Panama Canal
zone, 2-4

measures adopted in Cuba and
Panama for prevention of, 2, 3
Fish, shell-fish and, individual sus-
ceptibility to poison from,
102, 103

Fishes, age of, method of telling, 69
poisonous, 103

poison-spines of, 107, III

Fixed stars, 221

Flack, Mr. Martin, experiments of,
with regard to oxygen gas,
260

Fleuss apparatus, 263-265
Flowers, perfumes discharged into
the air by, various effects of,
105. 106