Readings in evolution, genetics, and eugenicsUniversity of Chicago Press, 1921 - 523 pages |
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Common terms and phrases
A. R. Wallace acquired characters adaptation adult ancestors animals and plants appear become beetles birds blood body bones breeding causes changes chapter Charles Darwin chromatin color correlation Darwin descent determiners dominant Drosophila effect energy environment Eocene eugenics evidence evidences of evolution evolution idea evolutionary existence extinct fact factors fauna female fertilization forms fossils gametes genera genetics geological germ cells germ-cells germinal hereditary heredity human hybrids important individuals inheritance insects island isolation kind Lamarck lamarckiana later less living lower male mammals Mendel Mendelian Miocene modification mutations natural selection Neanderthal observed occur offspring organic evolution Origin of Species orthogenesis ovum pair parent peculiar species present principle produced race recessive resemblance result seeds sexual somatic spermatozoön stage structure struggle T. H. Morgan teeth theory of evolution tion tissues variations varieties various vestigial structures Vries Weismann young
Popular passages
Page 4 - There is grandeur in this view of life, with its several powers, having been originally breathed by the Creator into a few forms or into one; and that, whilst this planet has gone cycling on according to the fixed law of gravity, from so simple a beginning endless forms most beautiful and most wonderful have been, and are being evolved.
Page 501 - I am come that ye might have life, and that ye might have it more abundantly.
Page 4 - These laws, taken in the largest sense, being Growth with Reproduction ; Inheritance which is almost implied by reproduction ; Variability from the indirect and direct action of the conditions of life, and from use and disuse ; a Ratio of Increase so high as to lead to a struggle for Life, and as a consequence to Natural Selection, entailing Divergence of Character and the Extinction of less-improved forms. Thus, from the war of nature, from famine and death, the most exalted object which we are...
Page 249 - 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 269 - Given any species in any region, the nearest related species is not likely to be found in the same region nor in a remote region, but in a neighboring district separated from the first by a barrier of some sort, or at least by a belt of country, the breadth of which gives the effect of a barrier.
Page 18 - ... would it be too bold to imagine, that in the great length of time, since the earth began to exist, perhaps millions of ages before the commencement of the history of mankind, would it be too bold to imagine that all warm-blooded animals have arisen from one living filament...
Page 232 - Therefore, during the modification of the descendants of any one species, and during the incessant struggle of all species to increase in numbers, the more diversified the descendants become, the better will be their chance of success in the battle for life.
Page 18 - ... would it be too bold to imagine, that all warm-blooded animals have arisen from one living filament, which THE GREAT FIRST CAUSE endued with animality, with the power of acquiring new parts, attended with new propensities, directed by irritations, sensations, volitions, and associations; and thus possessing the faculty of continuing to improve by its own inherent activity-, and of delivering down those improvements by generation to its posterity, world without end!
Page 29 - ... success in his own sphere of activity, plunges into scientific questions with which he has no real acquaintance, only to obscure them by an aimless rhetoric, and distract the attention of his hearers from the real point at issue by eloquent digressions and skilled appeals to religious prejudice.
Page 29 - I asserted — and I repeat — that a man has no reason to be ashamed of having an ape for his grandfather. If there were an ancestor whom I should feel shame in recalling it would rather be a man — a man of restless and versatile intellect — who, not content with an equivocal success in his own sphere of activity, plunges into scientific questions with which he has no real acquaintance...