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acquired characters adaptive characters adduced animals appears argument argument from ignorance artificial selection become cause cessation of selection chapter climatic co-adaptation colour concerned congenital connexion continuity correlation Darwin Darwinian deduction definition degeneration degree distinction disuse doctrine due to natural epilepsy evidence experiments explain fact favour force of heredity Galton genera germ-plasm hereditary importance individuals inherited effects instincts kind Lamarck Lamarckian factors Lamarckian principles large proportional number less Lloyd Morgan matter merely modifications natural selection naturalists necessarily niata observed occur opinion organic evolution Origin of Species pangenesis panmixia parents particular peculiar plants possible present produced Professor Weismann's progeny prove question reason reflex action reflex mechanism regard remark restiform body reversal of selection sciatic nerve sexual selection somatogenetic specific characters statement structure sufficient suppose theory of heredity theory of natural tion transmission of acquired transmitted use-inheritance utility variations varieties Wallace Wallace's Weismann Weismann's theory
Page 314 - I did not formerly consider sufficiently the existence of structures, which, as far as we can at present judge, are neither beneficial nor injurious; and this I believe to be one of the greatest oversights as yet detected in my work.
Page 343 - THE OPEN COURT does not understand by religion any creed or dogmatic belief, but man's world-conception in so far as it regulates his conduct. The old dogmatic conception of religion is based upon the science of past ages; to base religion upon the maturest and truest thought of the present time is the object of The Op en Court. Thus, the religion of The Open Court is the Religion of Science, that is, the religion of verified and verifiable truth.
Page 2 - I have now recapitulated the facts and considerations which have thoroughly convinced me that species have been modified during a long course of descent. This has been effected chiefly through the natural selection of numerous successive, slight, favourable variations; aided in an important manner by the inherited effects of the use and disuse of parts; and in an unimportant manner, that is in relation to adaptive structures, whether past or present, by the direct action of external conditions, and...
Page 319 - The sutures in the skulls of young mammals have been advanced as a beautiful adaptation for aiding parturition, and no doubt they facilitate, or may be indispensable for this act; but as sutures occur in the skulls of young birds and reptiles, which have only to escape from a broken egg, we may infer that this structure has arisen from the laws of growth, and has been taken advantage of in the parturition of the higher animals.
Page 3 - This has been effected chiefly through the natural selection of numerous successive, slight, favourable variations; aided in an important manner by the inherited effects of the use and disuse of parts; and in an unimportant manner, that is in relation to adaptive structures, whether past or present, by the direct action of external conditions, and by variations which seem to ns in our ignorance to arise spontaneously.
Page 3 - ... selection. But as my conclusions have lately been much misrepresented, and it 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 14 - That is to say ; species vary by adding or by failing to retain certain characteristics ; and generic and other characters are found to appear or disappear in accordance with some law to be discussed farther on. I believe that this is the simplest mode of stating and explaining the law of variation : that some forms acquire something which their parents did not possess ; and that those which acquire something additional have to pass through more numerous stages than their ancestors ; and those which...
Page 103 - I have seen the transmission of the morbid state of the eye continue through four generations. In these animals modified by heredity, the two eyes generally protruded, although in the parents usually only one showed exophthalmia, the lesion having been made in most cases only on one of the corpora restiformia. "
Page 25 - The special faculties we have been discussing clearly point to the existence in man of something which he has not derived from his animal progenitors — something which we may best refer to as being of a spiritual essence or nature, capable of progressive development under favorable conditions.