Toes, a man who plays the violin with his, 50

Tools, organs are living tools, 2

---- the manufacture of, and that of organs, two species of the
same genus, 39

Touch, all senses modifications of the sense of touch, 47

Transformation of species, Buffon on the causes or means of, 159

Translation of the "Loves of the Plants" into French, 63, 258, 259

Translation of the "Zoonomia" into German, 71

---- of Dr. E. Darwin's other works, 195

Trapa Natans, Erasmus Darwin's note on, 260

Treviranus alluded to, 72

Tree, life seen as a tree, by Lamarck, 269

---- by C. Darwin, 270

---- nature compared to a, by Buffon, 171

Trees, the blind man who saw men as trees walking, 137

Trowel, the beaver has an incarnate trowel, 8

True, vitally, 227

---- all very, as far as it goes (that Nature is the most
important means of modification), 369

Truism, the survival of the fittest, a, 351

Tutbury bull running, 187

Tyndall, Professor, a rhapsody about C. Darwin, 41

---- calls evolution C. Darwin's theory, 360, 361

UNCLES and aunts do not beget their nephews and nieces, 367, 376

Unconscious, our acquired habits come to be done as unconsciously
as though instinctive, on repetition, 56

---- difference between my view of the, and Von Hartmann's, 58

Unconsciousness, the, with which habitual actions come to be
performed, 37, 38, 39, 56-58, 67, 203, 332, 381

Understanding, the peace of mind that passeth, 35

Unity of the individual, Buffon on the, 127, 128. (_See_ "Oneness")

"Unknown causes," according to Mr. Darwin, can do so much, but
not so much more, 359

---- their identity with spontaneous variability, 359

---- heredity only another name for, unless the "Life and Habit"
theory be adopted, 384

Upright position in man and certain apes, and children, Lamarck
on, 312

Upside down, the vertebrata are perambulating vegetables planted, 137

Use and organ, 44, 45, 47, 217, 218, 221, 292, 294, 296, 299, 301,
302, 304, 305, 307-309, 311, 323

VACUUM, an omniscient and omnipotent, 28

Vague, efforts and desires are vague in the outset, 47, 52, 384

Variation, C. Darwin declares the fact of variation to be the cause
of variation, 8, 9, 347, 369

Variations, one factor of modification provides, the other
accumulates, 227

---- Lamarck strove to discover the law underlying, 337

---- C. Darwin sees no cause underlying them, 339, 340

---- according to Lamarck,