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according activity adapt animals appear APPENDIX assume become believe birds body brain called cause cell centre cerebral hemispheres changes communication conceive connection consciousness Darwin definite described desire direction division effect efforts eggs evidence existence experience explain extended fact feeling followed force functions ganglia ganglion higher idea individual instinct intelligence kind knowledge laws less living maintain manner material matter means mechanism memory mental mental action mind modifications motion move movements natural selection necessary nerve nerve cells nerve centres nervous never object observed operation organism origin perform personalities phenomena physical physical laws possess present preserved produce profitable prove psychical question reason referred reflex action relation response result says sensation sense single soul species stimulus structure substance supposed term theory thought tion tissue unconscious units variations various whole
Page 231 - It is more conformable to the ordinary wisdom of nature to secure so necessary an act of the mind, by some instinct or mechanical tendency, which may be infallible in its operations...
Page 155 - If it could be proved that any part of the structure of any one species had been formed for the exclusive good of another species, it would annihilate my theory, for such could not have been produced through natural selection.
Page 196 - The minutest incidents of childhood, or forgotten scenes of later years, were often revived : I could not be said to recollect them ; for if I had been told of them when waking, I should not have been able to acknowledge them as parts of my past experience. But placed as they were before me, in dreams like intuitions, and clothed in all their evanescent circumstances and accompanying feelings, I recognised them instantaneously.
Page 119 - It may metaphorically be said that natural selection is daily and hourly scrutinising, throughout the world, the slightest variations; rejecting those that are bad, preserving and adding up all that are good; silently and insensibly working, whenever and wherever opportunity offers, at the improvement of each organic being in relation to its organic and inorganic conditions of life.
Page 231 - As nature has taught us the use of our limbs, without giving us the knowledge of the muscles and nerves, by which they are actuated; so has she implanted in us an instinct, which carries forward the thought in a correspondent course to that which she has established among external objects; though we are ignorant of those powers and forces, on which this regular course and succession of objects totally depends.
Page 213 - I cannot compare the soul more properly to any thing than to a republic or commonwealth in which the several members are united by the reciprocal ties of government and subordination, and give rise to other persons, who propagate the same republic in the incessant changes of its parts.
Page 118 - Several writers have misapprehended or objected to the term Natural Selection. Some have even imagined that natural selection induces variability, whereas it implies only the preservation of such variations as arise and are beneficial to the being under its conditions of life.
Page 3 - is a definite combination of heterogeneous changes, both simultaneous and successive, in correspondence with external coexistences and sequences.
Page 229 - ... not always with equal facility ; for the larger the products became, the more difficult he found it to proceed. He was asked the square root of 106,929; and before the number could be written down, he immediately answered, 327. He was then required to name the cube root of 268,336,125; and with equal facility and promptness he replied, 645.