les, according to C. Darwin, 374

---- _not_ the main cause of the winglessness of Madeira beetles,
according to C. Darwin, 377

---- "combined probably with disuse," will account, according to
C. Darwin, for the winglessness of Madeira beetles, 375

_Naturalistes_, _le peuple des_, 80, 171

Nature, the personification of comparatively venial, 367

---- and natural selection the same thing, 368, 369

---- the most important means of modification, and variation the
cause of variation, 369

Neck, Paley on the human, 17, 18

Need, sense of, the main idea in connection with evolution that is
left with the reader by the "Zoonomia," or "Philosophie
Zoologique," 363

Needle, 20,000 devils dancing a saraband on the point of a, 216

Nest, a bird will alter its nest a little, to meet altered
circumstances, 55

Nests, birds', Dr. E. Darwin on, 201

Neuter insects, "the demonstrative case of neuter insects,"
&c., 249, 298, 314

New countries, Buffon a hater of, 146

Nomenclature, mistaken for knowledge, 141

Nottingham market-place, Erasmus Darwin in, 182, 184, 197

OAK and man, the germs of, indistinguishable, 334

---- man may become as long-lived as the, 382

Obvious, Erasmus Darwin had no wish to see far beyond the, 197

Oken, alluded to, 72

Old age, the phenomena of, 67, 204, 381

---- and new worlds, Buffon on the fauna of, 145, &c.

One source for all life, Buffon on, 91

---- Erasmus Darwin on, 109, 233

Oneness of personality between parents and offspring, 37, 38, 39

---- Buffon on the, 151

---- Erasmus Darwin and Professor Hering on the, 198-200

---- Dr. E. Darwin's failure to grasp the whole facts in connection
with this, 198, 201, 203

---- Dr. E. Darwin on, 214, 215

---- Patrick Matthew on, 322, 323

---- mentioned, 332, 380, 381

Orang-outang, Buffon on the, 156-159

Organ and use. _See_ "Use."

---- and sense, interaction of the, Buffon on, 127

---- and faculty, Lamarck on, 255

Organs are living tools, 2

---- the manufacture of, and that of tools, two species of the
same genus, 39, 43, &c.

---- are the expressions of mental phases, 339, 341

Organic structures have a margin, 49, 50

Organic strictures and inorganic, Buffon on the, 153, &c.

Organisms, have been developed as man's inventions
have, 44, 46, 47, 384

"Origin of Species," the, cannot take permanent rank in the
literature of evolution, 62

---- has no _raison d'etre_,