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Evolution Without Natural Selection: Or, the Segregation of Species Without ...
Charles Dixon, Jr.
No preview available - 2015
Evolution Without Natural Selection: Or the Segregation of Species Without ...
No preview available - 2008
amongst animals areas of distribution beauty become constant Botanical breed breeding-area British Islands brown cause characters chestnut circumpolar climatic influences closely allied form Coal Tit common ancestor confined Darwin developed differentiated Dipper distinct species districts disuse driven southwards Duck east eastern and western Europe evolution evolved extreme forms females fertile glacial period Grouse head and neck hypothesis individuals instance interbreed interbreeding intercrossing interesting fact intermediate forms Joseph Wolf Lake Baikal males Manx Shearwater means of modifying modification of species mountains Natural Selection naturalists Nearctic Eegion North northern numerous Ocean Origin of Species ornithologists Pacific Palaearctic Parrot Crossbill peculiar plumage Polar present preserved probably races regions remarkable representative forms result sexual ornament Sexual Selection Shearwater Siberia similar slight differences species inhabiting sufficient takes place Tenesay Tenterden theory of Natural Thrushes Titmouse underparts uniform upper tail-coverts Ural Mountains valley variation variety western form whilst Whimbrel wings winter Zoology
Page 1 - ... the immutability of species, may be influenced by this volume; but I look with confidence to the future, to young and rising naturalists, who will be able to view both sides of the question with impartiality. Whoever is led to believe that species are mutable will do good service by conscientiously expressing his conviction; for thus only can the load of prejudice by which this subject is overwhelmed be removed.
Page 2 - ... has been stated that I attribute the modification of species exclusively to natural selection, I may be permitted to remark that in the first edition of this work, and subsequently, I placed in a most conspicuous position — namely, at the close of the Introduction the following words : "I am convinced that natural selection has been the main but not the exclusive means of modification.
Page 44 - had been at work. But if, further, we could see that these very modifications, though hurtful or useless at the time when they first appeared, became in the highest degree useful at a much later period, and are now essential to the full moral and intellectual development of human nature, we should then infer the action of mind, foreseeing the future and preparing for it, just as surely as we do, when we see the breeder set himself to work with the determination to produce a definite improvement...
Page 49 - The production of a new organ in an animal body results from the supervention of a new want continuing to make itself felt, and a new movement which this want gives birth to and encourages.
Page 55 - Now, what explanation does the law of Natural Selection give — I will not say of the origin, but even of the continuance and preservation — of such specific varieties as these ? None whatever. A crest of topaz is no better in the struggle for existence than a crest of sapphire. A frill ending in spangles of the emerald is no better in the battle of life than a frill ending in the spangles of the ruby.
Page 49 - Given the motive power which Lamarck suggested, and Mr. Darwin's mechanism would appear (with the help of memory, as bearing upon reproduction, of continued personality, and hence of inherited habit, and of the vanishing tendency of consciousness) to work with perfect ease.
Page 2 - Now it is distinctly enunciated by Mr. Darwin that the spontaneous variations upon which his theory depends are individually slight, minute, and insensible. He says (Animals and Plants under Domestication, Vol. II. p. 192): ' Slight individual differences, however, suffice for the work, and are probably the sole differences which are effective in the production of new species.