Darwinism and Human LifeHolt, 1917 - 263 pages |
From inside the book
Results 1-5 of 22
Page 81
... normal conditions , at a rate that would cause the offspring of a single individual to fill the ocean to the depth of a mile in five days ( H. E. Crampton ) . " The cholera bacillus can duplicate every twenty minutes , and might thus in ...
... normal conditions , at a rate that would cause the offspring of a single individual to fill the ocean to the depth of a mile in five days ( H. E. Crampton ) . " The cholera bacillus can duplicate every twenty minutes , and might thus in ...
Page 82
... normal number of adults . ( b ) Another reason follows from the pattern of the web of life - there are nutritive chains , one organism depending on another for its food - supply . Indeed , the struggle that strikes us most is that which ...
... normal number of adults . ( b ) Another reason follows from the pattern of the web of life - there are nutritive chains , one organism depending on another for its food - supply . Indeed , the struggle that strikes us most is that which ...
Page 88
... normal course of things , benefits others instead of benefiting self , then , from the dawn of life , altruism has been no less essential than egoism . Though primarily it is dependent on egoism , yet secondarily egoism is dependent on ...
... normal course of things , benefits others instead of benefiting self , then , from the dawn of life , altruism has been no less essential than egoism . Though primarily it is dependent on egoism , yet secondarily egoism is dependent on ...
Page 104
... normal sequence of chemical events . We may have thought of the same idea in connection with sex , where changes apparently confined to minute and superficial and unconnected parts may be , as it were , the correlated outcrop of one ...
... normal sequence of chemical events . We may have thought of the same idea in connection with sex , where changes apparently confined to minute and superficial and unconnected parts may be , as it were , the correlated outcrop of one ...
Page 105
... normal stages in the development of one creature , but as new steps of progress in successive genera- tions of creatures , we have the individual variations that Darwin most believed in as furnishing the raw materials of evolution . But ...
... normal stages in the development of one creature , but as new steps of progress in successive genera- tions of creatures , we have the individual variations that Darwin most believed in as furnishing the raw materials of evolution . But ...
Other editions - View all
Common terms and phrases
acquired characters adaptations Alfred Russel Wallace animals Arthur Thomson become biological birds blue body breed called cells Charles Darwin chromosomes colour continuity correlation Darwin's day Darwinian direction discriminate elimination disease dominant dysgenic egg-cell endeavour environment eugenic evidence fact factors favour female fertilised forms formula Galton gametes germ-cells germinal variations hereditary heredity heritable human society idea illustration important individual influence inheritance insects instance interpretation Karl Pearson kind large number larv¿ living creatures London male mating mean Mendelian MENDELIAN INHERITANCE mice modifica modifications mutations natural selection naturalists normal nurture nutritive chains offspring organic evolution Origin of Species ovum owe to Darwin parents peculiarities plants Prof progress PURPLE CLOVER qualities question race raw material Ray Lankester realise recognise regard result says scientific mood sifting spermatozoon struggle for existence suggested survival theory of natural things tion transmission variability Wallace
Popular passages
Page 69 - Nothing is easier than to admit in words the truth of the universal struggle for life, or more difficult — at least I have found it so — than constantly to bear this conclusion in mind. Yet unless it be thoroughly engrained in the mind, the whole economy of nature, with every fact on distribution, rarity, abundance, extinction, and variation, will be dimly seen or quite misunderstood.
Page 182 - I happened to read for amusement ' Malthus on Population, and being well prepared to appreciate the struggle for existence which everywhere goes on from long-continued observation of the habits of animals and plants, it at once struck me that under these circumstances • favourable variations would tend to be preserved, and unfavourable ones to be destroyed. The result of this would be the formation of a new species. Here, then, I had at last got a theory by which to work...
Page 36 - Therefore, my success as a man of science, whatever this may have amounted to, has been determined, as far as I can judge, by complex and diversified mental qualities and conditions. Of these, the most important have been — the love of science — unbounded patience in long reflecting over any subject — industry in observing and collecting facts — and a fair share of invention as well as of common-sense. With such moderate abilities as I possess, it is truly surprising that I should have influenced...
Page 70 - Within himself, from more to more; Or, crown'd with attributes of woe Like glories, move his course, and show That life is not as idle ore, But iron dug from central gloom, And heated hot with burning fears, And dipt in baths of hissing tears, And batter'd with the shocks of doom To shape and use.
Page 238 - And the eye cannot say unto the hand, I have no need of thee : nor again the head to the feet, I have no need of you.
Page 58 - It may be doubted whether there are many other animals which have played so important a part in the history of the world, as have these lowly organized creatures.
Page 53 - Newman, who has long attended to the habits of humble-bees, believes that "more than two-thirds of them are thus destroyed all over England.
Page 11 - ... greatly alter (as indeed I have observed in parts of South America) the vegetation: this again would largely affect the insects ; and this, as we...
Page 34 - I had, also, during many years followed a golden rule, namely, that whenever a published fact, a new observation or thought came across me, which was opposed to my general results, to make a memorandum of it without fail and at once; for I had found by 69 experience that such facts and thoughts were far more apt to escape from the memory than favourable ones.
Page 142 - It must be clearly understood that there is nothing in these statements to invalidate the general doctrine that the children of a gifted pair are much more likely to be gifted than the children of a mediocre pair. They merely express the fact that the ablest of all the children of a few gifted pairs is not likely to be as gifted as the ablest of all the children of a very great many mediocre pairs