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action Animal Intelligence ants appetence associated auditory beauty become bees believe birds body brain called canal cells characters colour complex conceptual consciousness constructs Darwin developed differentiation direct disuse effects eggs elimination embryo emotions experience fact factor faculty feelings female fertilized gemmules germ germ-plasm germinal germinal cells give rise habits higher human hydra hypothesis ideas individual inference inherited insects instinctive activities isolation kinesis kinetic less male mating matter means Mental Evolution metakinesis metakinetic metazoa millimetre mind mode modified muscles natural selection neurosis normal object observation offspring organism origin otoliths ovum pain parent perception performed perhaps phenomena physiological pleasure probably produced Professor Weismann protoplasm protozoa psychosis question reflex actions regard reproduction result retina Romanes seems seen semicircular canals sensations sense sexual sexual selection Sir John Lubbock species sperms stimulus suppose tendency term tion tissue variations words
Page 170 - The impression that all this evidence leaves on the mind is one of some wonder whether nurture can do anything at all, beyond giving instruction and professional training.
Page 108 - Domestication,' there are two factors: namely, the nature of the organism, and the nature of the conditions. The former seems to be much the more important; for nearly similar variations sometimes arise under, as far as we can judge, dissimilar conditions; and, on the other hand, dissimilar variations arise under conditions which appear to be nearly uniform.
Page 387 - But pain or suffering of any kind, if long continued, causes depression and lessens the power of action, yet is well adapted to make a creature guard itself against any great or sudden evil. Pleasurable sensations, on the other hand, may be long continued without any depressing effect ; on the contrary, they stimulate the whole system to increased action.
Page 386 - ... beings have been developed through natural selection, or the survival of the fittest, together with use or habit, will admit that these organs have been formed so that their possessors may compete successfully with other beings, and thus increase in number. Now an animal may be led to pursue that course of action which is most beneficial to the species by suffering, such as pain, hunger, thirst, and fear ; or by pleasure, as in eating and drinking, and in the propagation of the species, &c.;...
Page 78 - Can it, then, be thought improbable, seeing that variations useful to man have undoubtedly occurred, that other variations useful in some way to each being in the great and complex battle of life, should sometimes occur in the course of thousands of generations...
Page 387 - We see this in the pleasure from exertion, even occasionally from great exertion of the body or mind, — in the pleasure of our daily meals, and especially in the pleasure derived from sociability, and from loving our families. The sum of such pleasures as these, which are habitual or frequently recurrent, give, as I can hardly doubt, to most sentient beings an excess of happiness over misery, although many occasionally suffer much.
Page 381 - Under this powerful emotion the action of the heart is much accelerated, or it may be much disturbed. The face reddens, or it becomes purple from the impeded return of the blood, or may turn deadly pale. The respiration is laboured, the chest heaves, and the dilated nostrils quiver. The whole body often trembles. The voice is affected. The teeth are clenched or ground together, and the muscular system is commonly stimulated to violent, almost frantic action. But the gestures of a man in this state...
Page 151 - It is quite conceivable that every species tends to produce varieties of a limited number and kind, and that the effect of natural selection is to favour the development of some of these, while it opposes the development of others along their predetermined lines of modification.
Page 399 - Dogs show what may be fairly called a sense of humour, as distinct from mere play ; if a bit of stick or other such object be thrown to one, he will often carry it away for a short distance ; and then squatting down with it on the ground close before him, will wait until his master comes quite close to take it away. The dog will then seize it and rush away in triumph, repeating the same manoeuvre, and evidently enjoying the practical joke.